实验手册 - 第2周Spark RDD
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1 实验内容
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import os
os.getcwd()
'D:\\juniortwo\\spark'
导入numpy包
import numpy as np
实验1
实验1：已知：list01 = [“My name is John”, “How are you”]
（1）计算list01中各个元素的长度。输出格式：[15, 11]
（2）计算list01中各个元素中各个单词的长度。输出格式：
[2, 4, 2, 4, 3, 3, 3]
（3）计算list01中各个元素中各个单词的长度。输出格式：
[(“My”, 2), (“name”, 4), (“is”, 2), (“John”, 4), (“How”, 3), (“are”, 3), (“you”, 3)]
- 导包创建SparkContext对象
import findspark
findspark.init()
from pyspark import SparkContext
sc = SparkContext()
list01 = ["My name is John", "How are you"]
- parallelize内存式创建rdd
rdd1 = sc.parallelize(list01)
rdd1.map(lambda x:len(x)).collect()
[15, 11]
rdd1.flatMap(lambda x:x.split(' ')).map(lambda x:len(x)).collect()
[2, 4, 2, 4, 3, 3, 3]
rdd1.flatMap(lambda x:x.split(' ')).map(lambda x:(x,len(x))).collect()
[('My', 2),
('name', 4),
('is', 2),
('John', 4),
('How', 3),
('are', 3),
('you', 3)]
实验2
实验2：已知：numList = [[1, 3], [2, 4], [3, 5], [4, 6]]
请编程输出： [[1, 30], [2, 40], [3, 50], [4, 60]]
numList = [[1, 3], [2, 4], [3, 5], [4, 6]]
rdd2 = sc.parallelize(numList)
# rdd2.map(lambda x:len(x)).collect()
rdd2.map(lambda x:[x[0],x[1]*10]).collect()
[[1, 30], [2, 40], [3, 50], [4, 60]]
list01 = [1, 2, 3, 'a', 4, 'b']
实验3
实验3： 已知：list01 = [1, 2, 3, ‘a’, 4, ‘b’]，将其数字保持原样，非数字转换为0。
编程输出：[1, 2, 3, 0, 4, 0]
rdd3 = sc.parallelize(list01)
- 方法一：if语句判断
rdd3.map(lambda x:0 if x in ('a','b') else x).collect()
- 方法二：str(x).isdigit() 判断
# 方法一
sc.parallelize([1, 2, 3, 'a', 4, 'b']).map(lambda x : x if str(x).isdigit() else 0).collect()
- 方法三： isinstance() 函数来判断一个对象是否是一个已知的类型
# 方法二
sc.parallelize([1, 2, 3, 'a', 4, 'b']).map(lambda x : x if isinstance(x, int) else 0).collect()
- 方法四：自定义函数convertToZero()
# 方法三
def convertToZero(x):
try:
return int(x)
except:
return 0
sc.parallelize([1, 2, 3, 'a', 4, 'b']).map(convertToZero).collect()
## 等价于
sc.parallelize([1, 2, 3, 'a', 4, 'b']).map(lambda x : convertToZero(x)).collect()
[1, 2, 3, 0, 4, 0]
实验4
实验4： Others\nasa_19950801.tsv和Others\nasa_19950701.tsv文件 (tsv表示Tab Separated File)，是某网站其中两天的访问日志文件。每一行代表一条访问记录。
请编程：找出这两天均访问该网站的主机名(host)
- 去除表头
log1 = sc.textFile(r"D:\juniortwo\spark\Spark2023-02-20\Others\nasa_19950801.tsv")
firstLine = log1.first()
log01 = log1.filter(lambda x:x!=firstLine).map(lambda x:x.split('\t')[0])
log2 = sc.textFile(r"D:\juniortwo\spark\Spark2023-02-20\Others\nasa_19950701.tsv")
firstLine = log2.first()
log02 = log2.filter(lambda x:x!=firstLine).map(lambda x:x.split('\t')[0])
# log2.collect()
- 两表取交集
log01.intersection(log02).collect()
['www-d3.proxy.aol.com',
'www-d4.proxy.aol.com',
'piweba1y.prodigy.com',
'www-d1.proxy.aol.com',
'www-a1.proxy.aol.com',
'hella.stm.it',
'alpha2.csd.uwm.edu',
'bettong.client.uq.oz.au',
'beglinger.dial-up.bdt.com',
'disarray.demon.co.uk',
'vagrant.vf.mmc.com',
'piweba2y.prodigy.com',
'www-b5.proxy.aol.com',
'www-a2.proxy.aol.com',
'wwwproxy.info.au',
'palona1.cns.hp.com',
'pm206-52.smartlink.net',
'hitiij.hitachi.co.jp',
'magicall.dacom.co.kr',
'netcom3.netcom.com',
'piweba4y.prodigy.com',
'www-b3.proxy.aol.com',
'www-b2.proxy.aol.com',
'koala.melbpc.org.au',
'alyssa.prodigy.com',
'www-d2.proxy.aol.com',
'freenet.edmonton.ab.ca',
'ntigate.nt.com',
'dd08-021.compuserve.com',
'piweba3y.prodigy.com',
'columbia.acc.brad.ac.uk',
'reggae.iinet.net.au',
'server.elysian.net',
'ottgate2.bnr.ca',
'srv1.freenet.calgary.ab.ca',
'ccn.cs.dal.ca',
'spectrum.xerox.com']
实验5
实验5：在Flights\airlines.csv文件中
（1）计算总行数（不含表头）
（2）返回前10行（不含表头）
（3）找到Description中以A开头的数据，并将code和description构成元祖返回（不含表头）
rdd5 = sc.textFile(r"D:\juniortwo\spark\Spark2023-02-20\Flights\airlines.csv")
- 去表头统计总行数
firstLine = rdd5.first()
rdd5.filter(lambda x : x != firstLine).count()
1579
rdd5.filter(lambda x : x != firstLine).take(10)
['"19031","Mackey International Inc.: MAC"',
'"19032","Munz Northern Airlines Inc.: XY"',
'"19033","Cochise Airlines Inc.: COC"',
'"19034","Golden Gate Airlines Inc.: GSA"',
'"19035","Aeromech Inc.: RZZ"',
'"19036","Golden West Airlines Co.: GLW"',
'"19037","Puerto Rico Intl Airlines: PRN"',
'"19038","Air America Inc.: STZ"',
'"19039","Swift Aire Lines Inc.: SWT"',
'"19040","American Central Airlines: TSF"']
noHeader = rdd5.filter(lambda x : x != firstLine)
# noHeader.collect()
# noHeader.map(lambda x:x.split(',')[1]).take(5)
- filter和startswith(‘"A’)，文本本身自带了双引号——"
noHeader.filter(lambda x :x.split(',')[1].startswith('"A')).map(lambda x:(x.split(',')[0],x.split(',')[1])).collect()
## 如果觉得引号太多，不好看，可以：
noHeaderRDD.filter(lambda x : x.split(',')[1].startswith('"A')) \
.map(lambda x : (x.split(',')[0], x.split(',')[1])) \
.map(lambda x : (x[0].replace('"', ""), x[1].replace('"', ""))) \
.collect()
[('"19035"', '"Aeromech Inc.: RZZ"'),
('"19038"', '"Air America Inc.: STZ"'),
('"19040"', '"American Central Airlines: TSF"'),
('"19043"', '"Altair Airlines Inc.: AAR"'),
('"19050"', '"Alaska Aeronautical Indust.: AAZ"'),
('"19065"', '"Air Micronesia Inc.: AJ"'),
('"19069"', '"Air Cargo Express Inc.: ACG"'),
('"19070"', '"Associated Aviation Act.: AAA"'),
('"19071"', '"Antilles Air Boats Inc.: AAB"'),
('"19072"', '"AAA Airlines: AAE"'),
('"19073"', '"Argosy Air Lines Inc.: AAL"'),
('"19074"', '"Air Bahia: ABH"'),
('"19075"', '"Airbama Incorporated: ABI"'),
('"19076"', '"Aeronaves Boringuena Inc.: ABO"'),
('"19077"', '"Alaska Central Airways Inc.: ACA"'),
('"19079"', '"AAA-Action Air Carrier Inc.: ACI"'),
('"19080"', '"Air Cargo Enterprises Inc.: ACO"'),
('"19081"', '"Air Chaparral Inc.: ACP"'),
('"19082"', '"Alamo Commuter Airlines: ACS"'),
('"19083"', '"Air Central Inc. (1): ACT"'),
('"19084"', '"Air Central Inc.: ACK"'),
('"19085"', '"Astec Air East Inc.: AEC"'),
('"19086"', '"American Flag Airlines Inc.: AFA"'),
('"19087"', '"Air Cargo America Inc.: AGA"'),
('"19088"', '"All Island Air: AIA"'),
('"19089"', '"Air Express Inc.: AIE"'),
('"19090"', '"Air Mont. Inc.: AIM"'),
('"19091"', '"Air Indiana: AIN"'),
('"19092"', '"Air-Lift Associates Inc.: ALE"'),
('"19094"', '"All Seasons Air Pacific: ALL"'),
('"19096"', '"American Inter-Island Inc.: AMI"'),
('"19097"', '"Air Nebraska Inc.: ANB"'),
('"19098"', '"Airways Of New Mexico Inc.: ANM"'),
('"19100"', '"Air North/Nenana: ANT"'),
('"19102"', '"Arizona Pacific Inc.: API"'),
('"19103"', '"Appalachian Flying Service: APL"'),
('"19104"', '"Air Polynesia Inc.: APY"'),
('"19105"', '"Arizona Aero Corp.: ARI"'),
('"19106"', '"Arnold Aviation: ARN"'),
('"19107"', '"Air Oregon: ARO"'),
('"19108"', '"Arrowhead Airways Inc.: ARR"'),
('"19109"', '"Amistad Airlines: ASD"'),
('"19110"', '"Alpine Air Services Inc.: ASI"'),
('"19111"', '"Asap Air Inc.: ASP"'),
('"19112"', '"Astro Airways: AST"'),
('"19113"', '"Air Atlantic Airlines Inc.: ATN"'),
('"19115"', '"Atlantis Airlines Inc.: ATS"'),
('"19116"', '"Aerotransit Inc.: ATT"'),
('"19117"', '"Air Carolina: ATX"'),
('"19118"', '"Air Vectors Airways: AVA"'),
('"19119"', '"Aero Virgin Islands Corp.: AVI"'),
('"19120"', '"Aviation Services: AVS"'),
('"19141"', '"Air Virginia: CAV"'),
('"19185"', '"Air Pacific Inc.: EKA"'),
('"19230"', '"Air Chico: JCM"'),
('"19240"', '"Aero Commuter: LOS"'),
('"19255"', '"Arkansas Traveler Airline: MTA"'),
('"19276"', '"Air Kentucky Air Lines: OWS"'),
('"19282"', '"Air Pennsylvania: PER"'),
('"19300"', '"Aerosun International Airlines Inc.: RED"'),
('"19309"', '"Air Rovers Inc.: RWG"'),
('"19312"', '"Air Cortez International: SAS"'),
('"19313"', '"Air Americana: SAX"'),
('"19345"', '"Air Colorado: TAC"'),
('"19365"', '"Air U.S.: USA"'),
('"19371"', '"Air East Airlines: WAC"'),
('"19381"', '"Air New Mexico: ZIA"'),
('"19389"', '"Air Florida Inc.: QH"'),
('"19390"', '"Air California Inc.: OC"'),
('"19404"', '"Academy Airlines: ACD"'),
('"19407"', '"Airgo Inc.: AIG"'),
('"19408"', '"American Air Transport: AMT"'),
('"19417"', '"Air Freight Express: RRT"'),
('"19419"', '"Aero Union Corp: XAA"'),
('"19420"', '"Air Express International Airlines: XAC"'),
('"19427"', '"Aeronaves De Puerto Rico: XBQ"'),
('"19428"', '"Allstates Air Cargo Inc.: XBR"'),
('"19435"', '"Amerford Airways Inc.: XAE"'),
('"19436"', '"Astro-Wing Airlines Inc.: XAF"'),
('"19448"', '"Air Caravane Inc.: AEQ"'),
('"19449"', '"Argo S. A.: AGQ"'),
('"19451"', '"Alberta Northern Airlines: ALQ"'),
('"19452"', '"Aviacion Y Comercio S.A.: AO"'),
('"19453"', '"Air Bvi Limited: BLQ"'),
('"19457"', '"Aerolineas Dominicanas S A: DOQ"'),
('"19460"', '"Aero Trades (Western) Ltd.: ERQ"'),
('"19467"', '"Aerlinte Eireann Teoranta: IN"'),
('"19470"', '"Allarco Developments Ltd.: JXQ"'),
('"19482"', '"Air Niugini: NUQ"'),
('"19490"', '"Aerotransportes Entre Rios: RSQ"'),
('"19498"', '"Air Manila Inc.: UMQ"'),
('"19499"', '"Avalon Aviation Ltd.: VOQ"'),
('"19505"', '"Air Europe Limited: AE"'),
('"19509"', '"Air Haiti S. A.: HJ"'),
('"19512"', '"Aerolineas El Salvador S A: SZQ"'),
('"19514"', '"Aeronaves Del Peru: ADQ"'),
('"19520"', '"Andes: ED"'),
('"19522"', '"Aviateca: GU"'),
('"19526"', '"Air Nauru: ON"'),
('"19527"', '"Aero Peru: PL"'),
('"19530"', '"Air Afrique: RK"'),
('"19531"', '"Air Canada: AC"'),
('"19534"', '"Aeromexico: AM"'),
('"19535"', '"Aerolineas Argentinas: AR"'),
('"19537"', '"Aerovias Nacl De Colombia: AV"'),
('"19543"', '"Air China: CA"'),
('"19549"', '"Air Jamaica Limited: JM"'),
('"19568"', '"Alia-(The) Royal Jordanian: RJ"'),
('"19573"', '"Aeroflot Russian Airlines: SU"'),
('"19581"', '"Altus Airlines: ALT"'),
('"19582"', '"Atlantic Air: ANC"'),
('"19583"', '"Aero International Airlines: BAA"'),
('"19589"', '"Air East Of Delaware Inc.: AED"'),
('"19590"', '"Atlanta Express: ALX"'),
('"19591"', '"Air New Orleans: AOR"'),
('"19592"', '"Air Vermont Inc.: AVR"'),
('"19599"', '"Air Molakai: TRO"'),
('"19609"', '"Aerocondor: OD (1)"'),
('"19614"', '"Aeroservicios Ecuatorianos: EOQ"'),
('"19615"', '"Arista International Airlines Inc.: RAQ"'),
('"19620"', '"Aer Turas Teoranta: QTQ"'),
('"19621"', '"Aero B Venezuela C.A.: AFQ"'),
('"19622"', '"Air Ontario Limited: GX"'),
('"19623"', '"Aer Lingus Plc: EI"'),
('"19625"', '"Air Polynesia d/b/a DHL Cargo: XAB"'),
('"19626"', '"Air Natl Aircraft Sal & Ser: XBZ"'),
('"19627"', '"A/S Conair: CIQ"'),
('"19629"', '"Air Resorts Airlines: ARA"'),
('"19636"', '"Air One Inc.: CB"'),
('"19638"', '"Arcata Flying Service: AFS"'),
('"19645"', '"All Star Airlines Inc.: EP"'),
('"19646"', '"Aeron International Airlines Inc.: AXQ"'),
('"19649"', '"Alaska Island Air Inc.: LSZ"'),
('"19650"', '"Air Sunshine Inc.: AAT"'),
('"19653"', '"Air National: AHQ"'),
('"19655"', '"Aviation Associates: SNA"'),
('"19656"', '"Airmarc Airlines Inc.: ARM"'),
('"19659"', '"Audi Air Inc.: AAI"'),
('"19665"', '"Air Sedona: ARS"'),
('"19669"', '"Aermediterranea S.P.A.: AWQ"'),
('"19671"', '"Air Tungaru Corporation: VK"'),
('"19673"', '"Alpine Air: AAV"'),
('"19674"', '"Americair Inc.: AME"'),
('"19675"', '"Airspur Helicopters Inc.: ARP"'),
('"19678"', '"Aloha Airlines Inc.: AQ"'),
('"19679"', '"Air Spirit Inc.: APS"'),
('"19683"', '"Airmark Corporation: MKQ"'),
('"19685"', '"Aerial Transit Company: TPQ"'),
('"19698"', '"Air Charter (Safa): AQQ"'),
('"19700"', '"Alpha Air: APH"'),
('"19709"', '"AvAir: AMR"'),
('"19710"', '"Armstrong Air Service Inc.: AAP"'),
('"19713"', '"Alliance Airlines: ACN"'),
('"19714"', '"Astor Air: ASR"'),
('"19726"', '"AAR Western Skyways: WSK"'),
('"19732"', '"Action Airlines: AON"'),
('"19742"', '"Atlantic Gulf Airlines: ZY"'),
('"19760"', '"Air Hawaii: AHC"'),
('"19761"', '"Aerotal: XK"'),
('"19762"', '"Air L.A.: ALS"'),
('"19763"', '"Aero Coach: AEO"'),
('"19764"', '"Air Link Airways: ALK"'),
('"19774"', '"Airways International: AIT"'),
('"19777"', '"Airpac Inc.: XYZ"'),
('"19778"', '"Aerovias Venezolanas-Avensa: VE"'),
('"19788"', '"Air Puerto Rico Airlines: FD"'),
('"19791"', '"All Nippon Airways Co.: NH"'),
('"19793"', '"Anglo Airlines Ltd.: AZQ"'),
('"19800"', '"Air Cape: APE"'),
('"19805"', '"American Airlines Inc.: AA"'),
('"19806"', '"Air Charter Systems (Acs): WAQ"'),
('"19811"', '"Aero Tranportes Panamenos: ATQ"'),
('"19813"', '"Air Caribe International: ARB"'),
('"19814"', '"Air South (1): ASU"'),
('"19815"', '"Air South: ASH"'),
('"19823"', '"Air Train Inc.: XDE"'),
('"19828"', '"Air America: GM"'),
('"19833"', '"Aleutian Air: ALU"'),
('"19840"', '"Aerolineas Mundo: MUQ"'),
('"19853"', '"Airlift International: ARD"'),
('"19862"', '"Aerovias S.A.: AOQ"'),
('"19863"', '"Alas De Transporte International: APQ"'),
('"19870"', '"Aero Freight: AEF"'),
('"19873"', '"Austrian Airlines: OS"'),
('"19874"', '"Air Transport International: 8C"'),
('"19875"', '"Aero California: JR"'),
('"19886"', '"Aruba Cargo: IPQ"'),
('"19890"', '"Aeroejecutivos C.A.: EJQ"'),
('"19891"', '"Aeropuma: PUQ"'),
('"19892"', '"Aeronautica De Cancun: ACQ"'),
('"19893"', '"Aerovias Colombianas Arca: ARQ"'),
('"19900"', '"Air Marshall Islands Inc.: CW"'),
('"19904"', '"Air Southeast: ATH"'),
('"19909"', '"Air Belgium: BEQ"'),
('"19910"', '"Aerolineas Latinas: LNQ"'),
('"19911"', '"Air Aruba: FQ"'),
('"19914"', '"Air Liberte: LRQ"'),
('"19919"', '"Adirondack Airlines: ADR"'),
('"19927"', '"Aerosur (1): ASQ"'),
('"19930"', '"Alaska Airlines Inc.: AS"'),
('"19932"', '"Apa International Air S.A.: 7P"'),
('"19933"', '"Air New Zealand: NZ"'),
('"19943"', '"Allied Airlines: ALD"'),
('"19944"', '"Airvantage: AVG"'),
('"19955"', '"Affretair: ZL"'),
('"19961"', '"Air Transat: TS"'),
('"19968"', '"Arizona Pacific Airways: AZP"'),
('"19972"', '"Av Atlantic: HCQ"'),
('"19973"', '"Aerotour Dominicano Cxa: RTQ"'),
('"19974"', '"Aero Uruguay (1): ROQ"'),
('"19975"', '"Aero Uruguay: URQ"'),
('"19976"', '"Air North: 4N"'),
('"19978"', '"Air Alpha: AHA"'),
('"19979"', '"Alliance Air: AIY"'),
('"19987"', '"Advantage Airlines: ADV"'),
('"19988"', '"Air West Airlines: AWA"'),
('"19991"',
'"America West Airlines Inc.: HP (Merged with US Airways 9/05.Stopped reporting 10/07.)"'),
('"19993"', '"Airmark Airlines Inc.: AKQ"'),
('"19995"', '"Aces Airlines: VX (1)"'),
('"20007"', '"Atlas Air Inc.: 5Y"'),
('"20010"', '"Aero Transcolombiana: CLQ"'),
('"20011"', '"Air Casino: ASN"'),
('"20028"', '"Aerochago S.A.: G3 (1)"'),
('"20030"', '"Aerolineas Uruguayas S.A.: UYQ"'),
('"20032"', '"Air Europe S.P.A.: PE"'),
('"20035"', '"Air Florida Express: AFE"'),
('"20036"', '"American Flight Group: AFG"'),
('"20037"', '"Aviation Sales: AVL"'),
('"20043"', '"Air Ukraine: 6U"'),
('"20044"', '"Aeromonterrey S.A.: 7M"'),
('"20046"', '"Air Wisconsin Airlines Corp: ZW"'),
('"20056"', '"Antigua Paradise Airways: PDQ"'),
('"20058"', '"Air Pacific Ltd. (1): FJ (1)"'),
('"20059"', '"Air Pacific Ltd.: FJ"'),
('"20060"', '"Air South Inc. (1): WV (1)"'),
('"20061"', '"Air South Inc.: ASC"'),
('"20066"', '"Advance Air Charters: AAQ"'),
('"20075"', '"Aeromar C. Por A.: BQ"'),
('"20084"', '"Aspen Airways Inc.: APN"'),
('"20085"', '"Aeromexpress: QO"'),
('"20110"', '"Antonov Company: ADB"'),
('"20114"', '"Air Caribbean (1): XC"'),
('"20115"', '"Air Caribbean: AIC"'),
('"20118"', '"Air Illinois Inc.: UX (1)"'),
('"20119"', '"Air Europa: UX"'),
('"20121"', '"Air Atlantic Dominicana: LU"'),
('"20123"', '"Aeroejecutivo S.A.: SX (1)"'),
('"20139"', '"Air Atlanta Inc.: CC (1)"'),
('"20140"', '"Air Atlanta Icelandic: CC"'),
('"20141"', '"Austin Express Inc.: AUX"'),
('"20151"', '"Amerijet International: M6"'),
('"20152"', '"Aviacsa Airlines: 6A"'),
('"20154"', '"Airbus Transport Internat\'l: BGQ"'),
('"20155"', '"Aeropostal Alas De Venezuel: VH"'),
('"20156"', '"ABSA-Aerolinhas Brasileiras: M3"'),
('"20158"', '"Av Center Inc.: AVC"'),
('"20162"', '"Air Tahiti Nui: TN"'),
('"20164"', '"Accessair Holdings: ZA"'),
('"20171"', '"American International Airways Inc.: NI (1)"'),
('"20174"', '"Air Ketchum Idaho Inc.: AIK"'),
('"20177"', '"Asia Pacific: PFQ"'),
('"20189"', '"Aero Continente: N6"'),
('"20194"', '"Arrow Air Inc.: JW"'),
('"20196"', '"Air Malta: KM"'),
('"20201"', '"Ameristar Air Cargo: AMQ"'),
('"20205"', '"Aeromaritime: OV"'),
('"20209"', '"Air Japan Co: NQ"'),
('"20214"', '"Avia Leasing Company: AD"'),
('"20216"', '"Air Liberte Aka Aom Minerve: IW"'),
('"20217"', '"Air Excursions LLC (1): AEX"'),
('"20220"', '"Air 21: A7 (1)"'),
('"20221"', '"Air Comet S.A.: A7"'),
('"20239"', '"All Canada Express: CEQ"'),
('"20246"', '"Atlantic Coast Jet Inc.: ACJ"'),
('"20250"', '"Aerolitoral: 5D"'),
('"20256"', '"Arizona Airways: ARZ"'),
('"20269"', '"Allegheny Airlines: HRZ"'),
('"20277"', '"Asiana Airlines Inc.: OZ"'),
('"20279"', '"Air-Serve: RSV"'),
('"20290"', '"Air St. Thomas: ZP"'),
('"20291"', '"Air Midwest Inc.: ZV"'),
('"20292"', '"Airbc Ltd.: ZX (1)"'),
('"20293"', '"Air Georgian: ZX"'),
('"20296"', '"Aero Costa Rica: ML"'),
('"20309"', '"Aerosvit Ukranian Airlines: VV"'),
('"20312"', '"ATA Airlines d/b/a ATA: TZ"'),
('"20325"', '"Arctic Circle Air Service: 5F"'),
('"20330"', '"Arctic Transportation: 7S"'),
('"20337"', '"Alaska Seaplane Service: J5"'),
('"20341"', '"Alaska Central Express: KO"'),
('"20343"', '"Airlift International Inc.: RD (1)"'),
('"20354"', '"Aerodynamics Inc.: AJQ"'),
('"20357"', '"Astar USA'),
('"20365"', '"Aviation Concepts: CZQ"'),
('"20368"', '"Allegiant Air: G4"'),
('"20381"', '"Air Atlanta Europe: EUQ"'),
('"20385"', '"Air Panama Internacional: OP (1)"'),
('"20411"', '"Arizona Express: K7"'),
('"20419"', '"Aerolineas Nicaraguenses: RL (1)"'),
('"20429"', '"Aero Laguna S.A. De C.V.: AVQ"'),
('"20430"', '"Aerodan S.A. De C.V.: AYQ"'),
('"20431"', '"Aero Rentas De Coahuila S.A. De C.V.: BAQ"'),
('"20432"', '"Aerotaxis De Aguascalientes S.A. De C.V.: BDQ"'),
('"20437"', '"AirTran Airways Corporation: FL"'),
('"20438"', '"Air Club International: HB (1)"'),
('"20446"', '"Aerotransportes Mas De Crga: M7"'),
('"20449"', '"Aero-Services-Corporate: WEQ"'),
('"20453"', '"ABX Air'),
('"20456"', '"Air Foyle Limited: GS"'),
('"21007"', '"Abaco Air'),
('"21061"', '"Aerounion Aerotransporte de Carga Union SA de CV: 6R"'),
('"21074"', '"Arrow Panama: WAP"'),
('"21126"', '"ANA & JP Express Co. Ltd.: 9N"'),
('"21142"', '"Avior Airlines'),
('"21196"', '"ACM AIR CHARTER GmbH: 0CQ"'),
('"21294"', '"Aeromexico Travel: TRA"'),
('"21312"', '"Air Greco'),
('"21323"', '"Aerosur: 5L"'),
('"21342"', '"Aeroenlaces Nacionales'),
('"21352"', '"Avjet Corporation: 0WQ"'),
('"21361"', '"Air Berlin PLC and CO: AB"'),
('"21373"', '"Aeroservices Executive: BES"'),
('"21386"', '"Air Excursions LLC: X4"'),
('"21406"', '"Acropolis Aviation Ltd.: CRV"'),
('"21427"', '"AeroLogic GmbH: 3S"'),
('"21440"', '"Air Alsie A/S: 15Q"'),
('"21447"', '"Albinati Aeronautics SA: 17Q"'),
('"21463"', '"Aerovias de Intergracian Regional: 4C"'),
('"21467"', '"Arik Air International: W3"'),
('"21487"', '"AirBridgeCargo Airlines Limited: RU"'),
('"21507"', '"Aerolineas Galapagos S A Aerogal: 2K"'),
('"21522"', '"Alsek Air: 1FQ"'),
('"21532"', '"Air Finland Ltd.: OF"'),
('"21569"', '"Amira Air GmbH: XPE"'),
('"21574"', '"Air Company Yakutia: R3"'),
('"21578"', '"ABC Aerolineas SA de CV dba Interjet: 4O"'),
('"21610"', '"Air Canada rouge LP: RV"'),
('"21615"', '"Air Charter'),
('"21634"', '"Aloha Air Cargo: KH"')]
# taiburongyile
实验6
实验6：Stack Overflow网站在2016年做了一个在线问卷调查，来自世界各地的人参加了这项调查。
调查结果已经保存在Others\2016-stack-overflow-survey-responses.csv文件中。
请编程计算：
（1）有多少来自中国的参与者（不含表头）？（country列记录了参与者所在的国家）
（2）过滤掉2016-stack-overflow-survey-responses.csv中任何字段为空的数据条目。
textFile这里采用文本创建rdd，绝对路径不容易出错，前面要加上r，避免形成转义字符
rdd6 = sc.textFile(r"D:\juniortwo\spark\Spark2023-02-20\Others\2016-stack-overflow-survey-responses.csv")
firstLine1 = rdd6.first()
rdd6.filter(lambda x : x != firstLine1).filter(lambda x:x.split(',')[1]=='China').count()
21
rdd6.take(10)
['No,country,un_subregion,so_region,age_range,gender,salary,desktop_os',
'1888,Afghanistan,Southern Asia,Central Asia,20-24,Male,,',
'4637,Afghanistan,Southern Asia,Central Asia,30-34,Male,45000,Mac OS X',
'11164,Afghanistan,Southern Asia,Central Asia,,,,',
'21378,Afghanistan,Southern Asia,Central Asia,,Female,5000,Other Linux',
'30280,Afghanistan,Southern Asia,Central Asia,> 60,Prefer not to disclose,,',
'31355,Afghanistan,Southern Asia,Central Asia,20-24,Prefer not to disclose,,',
'31743,Afghanistan,Southern Asia,Central Asia,,Other,210000,Windows 10',
'51301,Afghanistan,Southern Asia,Central Asia,25-29,Male,5000,Windows 8',
'13017,Albania,Southern Europe,Eastern Europe,25-29,Other,,']
- 方法一：这种方法过滤空值，改变了原有数据结构
rdd6.map(lambda x:x.split(',')).take(5)
[['No',
'country',
'un_subregion',
'so_region',
'age_range',
'gender',
'salary',
'desktop_os'],
['1888',
'Afghanistan',
'Southern Asia',
'Central Asia',
'20-24',
'Male',
'',
''],
['4637',
'Afghanistan',
'Southern Asia',
'Central Asia',
'30-34',
'Male',
'45000',
'Mac OS X'],
['11164', 'Afghanistan', 'Southern Asia', 'Central Asia', '', '', '', ''],
['21378',
'Afghanistan',
'Southern Asia',
'Central Asia',
'',
'Female',
'5000',
'Other Linux']]
noHeader = rdd6.filter(lambda x : x != firstLine1)
- is not等价于!=
# x is not None
noHeader.flatMap(lambda x:x.split(',')).filter(lambda x:x is not '').collect()
- 方法二：
rdd = sc.textFile(r"Others\2016-stack-overflow-survey-responses.csv")
header = rdd.first()
noHeaderRDD = rdd.filter(lambda x : x != header)
noHeaderRDD.take(5)
# (1)
noHeaderRDD.filter(lambda x : x.split(',')[1] == "China").count()
# (2)
splitRDD = noHeaderRDD.map(lambda x : x.split(","))
splitRDD.take(5)
splitRDD.filter(lambda x : "" not in x).collect()
[['4637',
'Afghanistan',
'Southern Asia',
'Central Asia',
'30-34',
'Male',
'45000',
'Mac OS X'],
['51301',
'Afghanistan',
'Southern Asia',
'Central Asia',
'25-29',
'Male',
'5000',
'Windows 8'],
['24487',
'Albania',
'Southern Europe',
'Eastern Europe',
'20-24',
'Male',
'5000',
'Windows 10'],
['49685',
'Albania',
'Southern Europe',
'Eastern Europe',
'20-24',
'Male',
'15000',
'Windows 10'],
['50525',
'Albania',
'Southern Europe',
'Eastern Europe',
'25-29',
'Female',
'5000',
'Windows 10'],
['50541',
'Albania',
'Southern Europe',
'Eastern Europe',
'25-29',
'Male',
'5000',
'Mac OS X'],
['51884',
'Albania',
'Southern Europe',
'Eastern Europe',
'20-24',
'Male',
'15000',
'Windows 7'],
['27219',
'Algeria',
'Northern Africa',
'Africa',
'25-29',
'Male',
'15000',
'Ubuntu'],
['29553',
'Algeria',
'Northern Africa',
'Africa',
'20-24',
'Male',
'95000',
'Windows 10'],
['31646',
'Algeria',
'Northern Africa',
'Africa',
'20-24',
'Male',
'5000',
'Mac OS X'],
['52957',
'Algeria',
'Northern Africa',
'Africa',
'20-24',
'Male',
'5000',
'Mac OS X'],
['348',
'Andorra',
'Southern Europe',
'Western Europe',
'40-49',
'Male',
'45000',
'Windows 10'],
['34171',
'Andorra',
'Southern Europe',
'Western Europe',
'20-24',
'Female',
'35000',
'Windows 10'],
['24573',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Ubuntu'],
['28900',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'35000',
'Ubuntu'],
['29315',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'15000',
'Mint'],
['30889',
'Argentina',
'South America',
'South America',
'< 20',
'Male',
'5000',
'Windows 10'],
['31035',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'15000',
'Ubuntu'],
['31148',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Windows 7'],
['31165',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'15000',
'Ubuntu'],
['31252',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Ubuntu'],
['31277',
'Argentina',
'South America',
'South America',
'20-24',
'Female',
'15000',
'Ubuntu'],
['31422',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'5000',
'Debian'],
['31541',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'75000',
'Mac OS X'],
['31978',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'95000',
'Ubuntu'],
['32168',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'25000',
'Windows 7'],
['32183',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'210000',
'Ubuntu'],
['32294',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'35000',
'Windows 7'],
['32492',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'25000',
'Windows 10'],
['32506',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'35000',
'Mac OS X'],
['32835',
'Argentina',
'South America',
'South America',
'< 20',
'Male',
'5000',
'Windows 7'],
['32970',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 7'],
['32991',
'Argentina',
'South America',
'South America',
'25-29',
'Female',
'5000',
'Mac OS X'],
['33306',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Mac OS X'],
['33345',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 8'],
['33620',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'15000',
'Windows 7'],
['33764',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 10'],
['33820',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'85000',
'Windows 10'],
['35266',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'45000',
'Ubuntu'],
['35338',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'5000',
'Mint'],
['35375',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'25000',
'Windows 7'],
['35431',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Ubuntu'],
['35446',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Ubuntu'],
['35628',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'5000',
'Ubuntu'],
['35750',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'15000',
'Windows 8'],
['35760',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Debian'],
['36103',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'5000',
'Debian'],
['36123',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Mac OS X'],
['36390',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Mac OS X'],
['36493',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Ubuntu'],
['36495',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 10'],
['36546',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'45000',
'Debian'],
['36662',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'35000',
'Fedora'],
['36693',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'5000',
'Other Linux'],
['36753',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'15000',
'Windows 7'],
['36754',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'25000',
'Windows 7'],
['36761',
'Argentina',
'South America',
'South America',
'20-24',
'Female',
'35000',
'Ubuntu'],
['36987',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'55000',
'Ubuntu'],
['37250',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Ubuntu'],
['37268',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'45000',
'Mac OS X'],
['38200',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'15000',
'Windows 7'],
['41768',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'5000',
'Windows 7'],
['42038',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'5000',
'Windows 10'],
['42306',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'55000',
'Mac OS X'],
['42345',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 7'],
['42991',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Mint'],
['43299',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 8'],
['44276',
'Argentina',
'South America',
'South America',
'35-39',
'Female',
'35000',
'Windows 7'],
['45382',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'35000',
'Windows 10'],
['45695',
'Argentina',
'South America',
'South America',
'35-39',
'Female',
'15000',
'Windows 8'],
['46042',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Debian'],
['46055',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'5000',
'Ubuntu'],
['46184',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Ubuntu'],
['46268',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'15000',
'Ubuntu'],
['46362',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Mac OS X'],
['46383',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'55000',
'Debian'],
['46495',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'45000',
'Windows 10'],
['46516',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Ubuntu'],
['46676',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'85000',
'Mac OS X'],
['46738',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'5000',
'Mint'],
['46790',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'5000',
'Windows 8'],
['46852',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'25000',
'Windows 7'],
['46896',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'5000',
'Windows 7'],
['46921',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'15000',
'Windows 8'],
['46926',
'Argentina',
'South America',
'South America',
'30-34',
'Female',
'5000',
'Windows 10'],
['46930',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'75000',
'Mac OS X'],
['47849',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Other Linux'],
['47856',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Mac OS X'],
['47881',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 10'],
['47887',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Ubuntu'],
['47935',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Windows 10'],
['47960',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'35000',
'Mint'],
['48012',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'5000',
'Windows 8'],
['48025',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'25000',
'Windows 7'],
['48183',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Mac OS X'],
['48450',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'15000',
'Ubuntu'],
['48505',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'5000',
'Other Linux'],
['48604',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 7'],
['49241',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'65000',
'Windows 10'],
['49500',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Mac OS X'],
['49552',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'5000',
'Windows 10'],
['49602',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 7'],
['49686',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Mac OS X'],
['49697',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'25000',
'Windows 7'],
['49835',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 8'],
['49901',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 10'],
['50049',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'35000',
'Ubuntu'],
['50115',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'25000',
'Ubuntu'],
['50369',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 10'],
['50407',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 7'],
['50432',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'45000',
'Mac OS X'],
['50479',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'145000',
'Windows 7'],
['50546',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 7'],
['50550',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 10'],
['50609',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'55000',
'Mac OS X'],
['51202',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'25000',
'Mac OS X'],
['51261',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'35000',
'Windows 7'],
['51312',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'15000',
'Windows 7'],
['51466',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'25000',
'Debian'],
['51575',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'15000',
'Windows 10'],
['51579',
'Argentina',
'South America',
'South America',
'35-39',
'Male',
'15000',
'Ubuntu'],
['51603',
'Argentina',
'South America',
'South America',
'40-49',
'Male',
'75000',
'Mac OS X'],
['51624',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 8'],
['51643',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Windows 7'],
['51945',
'Argentina',
'South America',
'South America',
'25-29',
'Male',
'15000',
'Debian'],
['52959',
'Argentina',
'South America',
'South America',
'20-24',
'Male',
'5000',
'Windows 8'],
['53020',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'35000',
'Other Linux'],
['53083',
'Argentina',
'South America',
'South America',
'30-34',
'Male',
'25000',
'Ubuntu'],
['2498',
'Armenia',
'Western Asia',
'Eastern Europe',
'< 20',
'Male',
'5000',
'Windows 10'],
['28436',
'Armenia',
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'Windows 10'],
['50762',
'Finland',
'Northern Europe',
'Western Europe',
'25-29',
'Male',
'55000',
'Ubuntu'],
['50830',
'Finland',
'Northern Europe',
'Western Europe',
'20-24',
'Male',
'5000',
'Mac OS X'],
['50858',
'Finland',
'Northern Europe',
'Western Europe',
'25-29',
'Male',
'45000',
'Mac OS X'],
['50884',
'Finland',
'Northern Europe',
'Western Europe',
'20-24',
'Male',
'25000',
'Windows 10'],
['51226',
'Finland',
'Northern Europe',
'Western Europe',
'25-29',
'Male',
'35000',
'Mac OS X'],
['52031',
'Finland',
'Northern Europe',
'Western Europe',
'35-39',
'Male',
'55000',
'Mac OS X'],
['52124',
'Finland',
'Northern Europe',
'Western Europe',
'20-24',
'Male',
'25000',
'Windows 10'],
['52432',
'Finland',
'Northern Europe',
'Western Europe',
'35-39',
'Male',
'65000',
'Windows 10'],
['84',
'France',
'Western Europe',
'Western Europe',
'25-29',
'Male',
'45000',
'Windows 7'],
['260',
'France',
'Western Europe',
'Western Europe',
'30-34',
'Male',
'45000',
'Windows 7'],
['1105',
'France',
'Western Europe',
'Western Europe',
'20-24',
'Male',
'5000',
'Fedora'],
['1116',
'France',
'Western Europe',
'Western Europe',
'25-29',
'Male',
'5000',
'Mac OS X'],
['1415',
'France',
'Western Europe',
'Western Europe',
'40-49',
'Male',
'105000',
'Windows 7'],
['1421',
'France',
'Western Europe',
'Western Europe',
'40-49',
'Male',
'35000',
'Windows 10'],
['1478',
'France',
'Western Europe',
'Western Europe',
'25-29',
'Male',
'45000',
'Ubuntu'],
['1587',
'France',
'Western Europe',
'Western Europe',
'50-59',
'Male',
'45000',
'Windows 7'],
['2130',
'France',
'Western Europe',
'Western Europe',
'35-39',
'Male',
'55000',
'Windows 7'],
['2141',
'France',
'Western Europe',
'Western Europe',
'25-29',
'Male',
'55000',
'Mac OS X'],
['2353',
'France',
'Western Europe',
'Western Europe',
'20-24',
'Male',
'5000',
'Debian'],
['2394',
'France',
'Western Europe',
'Western Europe',
'25-29',
'Male',
'35000',
'Mint'],
['2651',
'France',
'Western Europe',
'Western Europe',
'20-24',
'Male',
'95000',
'Mac OS X'],
['2659',
'France',
'Western Europe',
'Western Europe',
'20-24',
'Male',
'5000',
'Windows 10'],
['2679',
'France',
'Western Europe',
'Western Europe',
'20-24',
'Male',
'35000',
'Ubuntu'],
...
2 实验总结
2.1 Spark应用开发步骤
1. 通过findspark找到并导入pyspark
import findspark
findspark.init()
from pyspark import SparkContext
2. 创建SparkContext对象
sc = SparkContext()
3. 读取数据源，生成RDD对象
（1）从内存读取数据源
sc.parallelize(list)
（2）从文件读取数据源
sc.textFile(r’文件路径’)
4. 对RDD进行Tranformation操作
mapRdd = rdd.map(lambda x:len(x))
5. 对RDD进行Action操作
mapRdd.collect()
2.2 字符串的split()方法列表解析式
- 以空格为分隔符
“What is your name”
split(‘ ’) —>
结果：[“What”, “is”, “your”, “name”]
[ len(x) for x in [“Spark”, “Hadoop”, “Java”] ]
结果：[5, 6, 4]
[ x for x in [“Spark”, “Hadoop”, “Java”] if len(x) > 4]
结果：[‘Spark’, ‘Hadoop’]
2.3 常用的Action操作
- count()：返回RDD行数
- first()：返回RDD第一行的数据
- take(n)：以列表形式返回前n行数据
- collect()：以列表形式返回RDD中所有的数据
2.4 常用的Transformation操作
- map()：一对一映射，不改变RDD的行数
- flatMap()：一对多映射，会增加RDD的函数
- filter(n)：过滤，会减少RDD的行数
2.5 RDD间的Transformation操作
1. union：并集。不去重
2. intersection：交集。去重
4. subtract：差集。不去重
重点：
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