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Pandas Example – Write a Pandas program to split a given dataframe into groups and create a new column with count from GroupBy

By on Tuesday, April 13, 2021

(Python Example for Beginners)

 

Write a Pandas program to split a given dataframe into groups and create a new column with count from GroupBy.

 

Test Data:

  book_name book_type  book_id
0     Book1      Math        1
1     Book2   Physics        2
2     Book3  Computer        3
3     Book4   Science        4
4     Book1      Math        1
5     Book2   Physics        2
6     Book3  Computer        3
7     Book5   English        5

 

Sample Solution:

Python Code :


import pandas as pd

pd.set_option('display.max_rows', None)

df = pd.DataFrame({
'book_name':['Book1','Book2','Book3','Book4','Book1','Book2','Book3','Book5'],
'book_type':['Math','Physics','Computer','Science','Math','Physics','Computer','English'],
'book_id':[1,2,3,4,1,2,3,5]})

print("Original Orders DataFrame:")
print(df)

print("nNew column with count from groupby:")

result = df.groupby(["book_name", "book_type"])["book_type"].count().reset_index(name="count")
print(result)

Sample Output:

Original Orders DataFrame:
  book_name book_type  book_id
0     Book1      Math        1
1     Book2   Physics        2
2     Book3  Computer        3
3     Book4   Science        4
4     Book1      Math        1
5     Book2   Physics        2
6     Book3  Computer        3
7     Book5   English        5

New column with count from groupby:
  book_name book_type  count
0     Book1      Math      2
1     Book2   Physics      2
2     Book3  Computer      2
3     Book4   Science      1
4     Book5   English      1

 

 

Pandas Example – Write a Pandas program to merge two given datasets using multiple join keys

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