Pandas: Add a prefix or suffix to all columns of a given DataFrame
Pandas: DataFrame Exercise-64 with Solution
Write a Pandas program to add a prefix or suffix to all columns of a given DataFrame.
Sample Solution :
Python Code :
import pandas as pd
df = pd.DataFrame({'W':[68,75,86,80,66],'X':[78,85,96,80,86], 'Y':[84,94,89,83,86],'Z':[86,97,96,72,83]});
print("Original DataFrame")
print(df)
print("\nAdd prefix:")
print(df.add_prefix("A_"))
print("\nAdd suffix:")
print(df.add_suffix("_1"))
Sample Output:
Original DataFrame W X Y Z 0 68 78 84 86 1 75 85 94 97 2 86 96 89 96 3 80 80 83 72 4 66 86 86 83 Add prefix: A_W A_X A_Y A_Z 0 68 78 84 86 1 75 85 94 97 2 86 96 89 96 3 80 80 83 72 4 66 86 86 83 Add suffix: W_1 X_1 Y_1 Z_1 0 68 78 84 86 1 75 85 94 97 2 86 96 89 96 3 80 80 83 72 4 66 86 86 83
Python-Pandas Code Editor:
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Previous: Write a Pandas program to remove last n rows of a given DataFrame.
Next: Write a Pandas program to reverse order (rows, columns) of a given 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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