Answers for "pandas dataframe change column values by function"

replace column values pandas

df['column'] = df['column'].str.replace(',','-')
df

df change column names

df.rename(columns={"A": "a", "B": "b", "C": "c"},
errors="raise", inplace=True)

replace values of pandas column

df.loc[df['column'] == 'column_value', 'column'] = 'new_column_value'