[Spark][Python]spark 从 avro 文件获取 Dataframe 的例子 从如下地址获取文件: https://github.com/databricks/spark-avro/raw/master/src/test/resources/episodes.avro 导入到 hdfs 系统: hdfs dfs -put episodes.avro 读入: mydata001=sqlContext.read.format("com.databricks.spark.avro&qu…

[Spark][Python]Spark 访问 mysql , 生成 dataframe 的例子: mydf001=sqlContext.read.format("jdbc").option("url","jdbc:mysql://localhost/loudacre")\ .option("dbtable","accounts").option("user","trainin…

Python,while循环小例子--猜拳游戏(三局二胜) import random all_choice = ['石头', '剪刀', '布'] prompt = '''(0)石头 (1)剪刀 (2)布 请选择(0\1\2)''' # 人的计分板 pwin = 0 # 计算机的计分板 cwin = 0 # 人和计算机都没有赢够两次则继续 while pwin < 2 and cwin < 2: # 人的选择在前,计算机随机选择在后,组成小列表,把所有人赢的情况再放到大列表中 win_lis…

[Spark][Python]DataFrame中取出有限个记录的例子 的 继续 [15]: myDF=peopleDF.where("age>21") In [16]: myDF.limit(2).show() +---+-------+-----+----+|age| name|pcode|pcoe|+---+-------+-----+----+| 30|Brayden|94304|null|| 46| Diana| null|null|+---+-------+-----…

[Spark][Python]DataFrame中取出有限个记录的例子 的 继续 In [4]: peopleDF.select("age")Out[4]: DataFrame[age: bigint] In [5]: myDF=people.select("age")---------------------------------------------------------------------------NameError Traceback (most…

[Spark][Python]DataFrame中取出有限个记录的   继续 In [4]: peopleDF.select("age","name") In [11]: myDF=peopleDF.select("age","name") In [14]: myDF.limit(2).show() +----+-------+| age| name|+----+-------+|null| Alice|| 30|Brayde…

Spark Python 索引页 为了查找方便,建立此页 === RDD 基本操作: [Spark][Python]groupByKey例子…

[training@localhost ~]$ hdfs dfs -cat people.json {"name":"Alice","pcode":"94304"}{"name":"Brayden","age":30,"pcode":"94304"}{"name":"Carla",&quo…

RDD flatMap 操作例子: flatMap,对原RDD的每个元素(行)执行函数操作,然后把每行都“拍扁” [training@localhost ~]$ hdfs dfs -put cats.txt[training@localhost ~]$ hdfs dfa -cat cats.txtError: Could not find or load main class dfa[training@localhost ~]$ hdfs dfs -cat cats.txtThe cat on…

map 就是对一个RDD的各个元素都施加处理,得到一个新的RDD 的过程 [training@localhost ~]$ cat names.txtYear,First Name,County,Sex,Count2012,DOMINIC,CAYUGA,M,62012,ADDISON,ONONDAGA,F,142012,ADDISON,ONONDAGA,F,142012,JULIA,ONONDAGA,F,15[training@localhost ~]$ hdfs dfs -put names.t…