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Pandas: Change Column Names

Unsolved
Data Wrangling

Difficulty: None | Problem written by bilaldadanlar

Educational Resource: https://web.stanford.edu/class/cs102/readings/pandasreferences.htm


Columns of pandas dataframes can be obtained by either df["column_name"] or df.column_name format. However, if the column name includes a white space between words, you can not use the second one. So its generally a good idea to replace white spaces with underscore.

Write a function that, given a pandas dataframe, replaces all white spaces (" ") in a column name with underscore ("_") and returns the dataframe.

Sample Input:
<class 'str'>
df: first name last name 0 Abraham Lincoln 1 Richard Nixon

Expected Output:
<class 'pandas.core.frame.DataFrame'>
0 0 Abraham,Lincoln 1 Richard,Nixon 2

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numpy has been already imported as np (import numpy as np)