Pandas: Split the specified dataframe into groups based on first column and set other column values into a list of values
Pandas Grouping and Aggregating: Split-Apply-Combine Exercise-13 with Solution
Write a Pandas program to split the following dataframe into groups based on first column and set other column values into a list of values.
Test Data:
X Y Z 0 10 10 22 1 10 15 20 2 10 11 18 3 20 20 20 4 30 21 13 5 30 12 10 6 10 14 0
Sample Solution:
Python Code :
import pandas as pd
df = pd.DataFrame( {'X' : [10, 10, 10, 20, 30, 30, 10],
'Y' : [10, 15, 11, 20, 21, 12, 14],
'Z' : [22, 20, 18, 20, 13, 10, 0]})
print("Original DataFrame:")
print(df)
result= df.groupby('X').aggregate(lambda tdf: tdf.unique().tolist())
print(result)
Sample Output:
Original DataFrame: X Y Z 0 10 10 22 1 10 15 20 2 10 11 18 3 20 20 20 4 30 21 13 5 30 12 10 6 10 14 0 Y Z X 10 [10, 15, 11, 14] [22, 20, 18, 0] 20 [20] [20] 30 [21, 12] [13, 10]
Python Code Editor:
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Previous: Write a Pandas program to split the following dataframe into groups, group by month and year based on order date and find the total purchase amount year wise, month wise.
Next: Write a Pandas program to split the following dataframe into groups based on all columns and calculate Groupby value counts on the dataframe.
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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