python flatmap code example

Example 1: flatmap python

array = [[1, 2], [3, 4]]

flatArray = [element for element in innerArray for innerArray in array]
# [1, 2, 3, 4]

Example 2: flatmap in python

rdd2=rdd.flatMap(lambda x: x.split(" "))
for element in rdd2.collect():
    print(element)

Example 3: flatmap in python

import pyspark
from pyspark.sql import SparkSession
spark = SparkSession.builder.appName('pyspark-by-examples').getOrCreate()

arrayData = [
        ('James',['Java','Scala'],{'hair':'black','eye':'brown'}),
        ('Michael',['Spark','Java',None],{'hair':'brown','eye':None}),
        ('Robert',['CSharp',''],{'hair':'red','eye':''}),
        ('Washington',None,None),
        ('Jefferson',['1','2'],{})
df = spark.createDataFrame(data=arrayData, schema = ['name','knownLanguages','properties'])

from pyspark.sql.functions import explode
df2 = df.select(df.name,explode(df.knownLanguages))
df2.printSchema()
df2.show()

Example 4: flatmap in python

data = ["Project Gutenberg’s",
        "Alice’s Adventures in Wonderland",
        "Project Gutenberg’s",
        "Adventures in Wonderland",
        "Project Gutenberg’s"]
rdd=spark.sparkContext.parallelize(data)
for element in rdd.collect():
    print(element)