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Pyspark
1.
```python !pip install pyspark ``` Collecting
pyspark Downloading pyspark-2.2.0.post0.tar.gz (188.3MB) Collecting py4j==0.10.4 (from pyspark) Downloading py4j-0.10.4-py2.py3-none-any.whl (186kB) Building wheels for collected packages: pyspark Running setup.py bdist_wheel for pyspark: started Running setup.py bdist_wheel for pyspark: finished with status 'done' Stored in directory: C:UsersDellAppDataLocalpipCachewheels5f0bb35cb16b15d28dcc32f8e 7ec91a044829642874bb7586f6e6cbe Successfully built pyspark Installing collected packages: py4j, pyspark Successfully installed py4j-0.10.4 pyspark-2.2.0 ```python from pyspark import SparkContext,SparkConf sc=SparkContext() ``` ```python import os ``` ```python os.getcwd() ``` 'C:UsersDell' ```python os.chdir('C:UsersDellDesktop') ``` ```python os.listdir() ```
2.
['desktop.ini', 'dump 2582017', 'Fusion Church.html', 'Fusion
Church_files', 'iris.csv', 'KOG', 'NF22997109906610.ETicket.pdf', 'R Packages', 'Telegram.lnk', 'twitter_share.jpg', 'winutils.exe', '~$avel Reimbursements.docx', '~$thonajay.docx'] ```python #load data data=sc.textFile('C:UsersDellDesktopiris.csv') ``` ```python type(data) ``` pyspark.rdd.RDD ```python data.top(1) ``` ['7.9,3.8,6.4,2,"virginica"'] ```python data.first() ```
3.
'"Sepal.Length","Sepal.Width","Petal.Length","Petal.Width","Species"' ```python from pyspark.sql import
SparkSession ``` ```python spark= SparkSession.builder .master("local") .appName("Data Exploration") .getOrCreate() ``` ```python #load data as Spark DataFrame data2=spark.read.format("csv") .option("header","true") .option("mode","DROPMALFORMED") .load('C:UsersDellDesktopiris.csv') ``` ```python type(data2) ``` pyspark.sql.dataframe.DataFrame ```python data2.printSchema() ``` root |-- Sepal.Length: string (nullable = true) |-- Sepal.Width: string (nullable = true) |-- Petal.Length: string (nullable = true) |-- Petal.Width: string (nullable = true) |-- Species: string (nullable = true)
4.
```python data2.columns ``` ['Sepal.Length', 'Sepal.Width', 'Petal.Length',
'Petal.Width', 'Species'] ```python data2.schema.names ``` ['Sepal.Length', 'Sepal.Width', 'Petal.Length', 'Petal.Width', 'Species'] ```python newColumns=['Sepal_Length', 'Sepal_Width', 'Petal_Length', 'Petal_Width', 'Species'] ``` ```python from functools import reduce ``` ```python data2 = reduce(lambda data2, idx: data2.withColumnRenamed(oldColumns[idx], newColumns[idx]), range(len(oldColumns)), data2) data2.printSchema() data2.show() ``` root |-- Sepal_Length: string (nullable = true) |-- Sepal_Width: string (nullable = true) |-- Petal_Length: string (nullable = true)
5.
|-- Petal_Width: string
(nullable = true) |-- Species: string (nullable = true) +------------+-----------+------------+-----------+-------+ |Sepal_Length|Sepal_Width|Petal_Length|Petal_Width|Species| +------------+-----------+------------+-----------+-------+ | 5.1| 3.5| 1.4| 0.2| setosa| | 4.9| 3| 1.4| 0.2| setosa| | 4.7| 3.2| 1.3| 0.2| setosa| | 4.6| 3.1| 1.5| 0.2| setosa| | 5| 3.6| 1.4| 0.2| setosa| | 5.4| 3.9| 1.7| 0.4| setosa| | 4.6| 3.4| 1.4| 0.3| setosa| | 5| 3.4| 1.5| 0.2| setosa| | 4.4| 2.9| 1.4| 0.2| setosa| | 4.9| 3.1| 1.5| 0.1| setosa| | 5.4| 3.7| 1.5| 0.2| setosa| | 4.8| 3.4| 1.6| 0.2| setosa| | 4.8| 3| 1.4| 0.1| setosa| | 4.3| 3| 1.1| 0.1| setosa| | 5.8| 4| 1.2| 0.2| setosa| | 5.7| 4.4| 1.5| 0.4| setosa| | 5.4| 3.9| 1.3| 0.4| setosa| | 5.1| 3.5| 1.4| 0.3| setosa| | 5.7| 3.8| 1.7| 0.3| setosa| | 5.1| 3.8| 1.5| 0.3| setosa| +------------+-----------+------------+-----------+-------+ only showing top 20 rows ```python data2.dtypes ``` [('Sepal_Length', 'string'), ('Sepal_Width', 'string'), ('Petal_Length', 'string'), ('Petal_Width', 'string'), ('Species', 'string')] ```python data3 = data2.select('Sepal_Length', 'Sepal_Width', 'Species') data3.cache() data3.count() ```
6.
150 ```python data3.show() ``` +------------+-----------+-------+ |Sepal_Length|Sepal_Width|Species| +------------+-----------+-------+ | 5.1| 3.5|
setosa| | 4.9| 3| setosa| | 4.7| 3.2| setosa| | 4.6| 3.1| setosa| | 5| 3.6| setosa| | 5.4| 3.9| setosa| | 4.6| 3.4| setosa| | 5| 3.4| setosa| | 4.4| 2.9| setosa| | 4.9| 3.1| setosa| | 5.4| 3.7| setosa| | 4.8| 3.4| setosa| | 4.8| 3| setosa| | 4.3| 3| setosa| | 5.8| 4| setosa| | 5.7| 4.4| setosa| | 5.4| 3.9| setosa| | 5.1| 3.5| setosa| | 5.7| 3.8| setosa| | 5.1| 3.8| setosa| +------------+-----------+-------+ only showing top 20 rows ```python data3.limit(5) ``` DataFrame[Sepal_Length: string, Sepal_Width: string, Species: string] ```python
7.
data3.limit(5).show() ``` +------------+-----------+-------+ |Sepal_Length|Sepal_Width|Species| +------------+-----------+-------+ | 5.1| 3.5|
setosa| | 4.9| 3| setosa| | 4.7| 3.2| setosa| | 4.6| 3.1| setosa| | 5| 3.6| setosa| +------------+-----------+-------+ ```python data3.limit(5).limit(2).show() ``` +------------+-----------+-------+ |Sepal_Length|Sepal_Width|Species| +------------+-----------+-------+ | 5.1| 3.5| setosa| | 4.9| 3| setosa| +------------+-----------+-------+ ```python data4=data2.selectExpr('CAST(Sepal_Length AS INT) AS Sepal_Length') ``` ```python data4 ``` DataFrame[Sepal_Length: int] ```python from pyspark.sql.functions import * ``` ```python data4.select('Sepal_Length').agg(mean('Sepal_Length')).show()
8.
``` +-----------------+ |avg(Sepal_Length)| +-----------------+ |5.386666666666667| +-----------------+ ```python data5=data2.selectExpr('CAST(Sepal_Length AS INT)
AS Sepal_Length','CAST(Petal_Width AS INT) AS Petal_Width','CAST(Sepal_Width AS INT) AS Sepal_Width','CAST(Petal_Length AS INT) AS Petal_Length','Species') ``` ```python data5 ``` DataFrame[Sepal_Length: int, Petal_Width: int, Sepal_Width: int, Petal_Length: int, Species: string] ```python data5.columns ``` ['Sepal_Length', 'Petal_Width', 'Sepal_Width', 'Petal_Length', 'Species'] ```python data5.select('Sepal_Length','Species').groupBy('Species').agg(mean("Sepal _Length")).show() ``` +----------+-----------------+ | Species|avg(Sepal_Length)| +----------+-----------------+ | virginica| 6.08|
9.
|versicolor| 5.48| | setosa|
4.6| +----------+-----------------+ ```python #df = data3.select(col('Sepal_Length'),dat.Sepal_Length.cast('float').alias('pr ice')) ```
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