pandas dataframe change row values by map code example

Example 1: replace column values pandas

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

Example 2: pandas rename column values dictionary

df['col1'].map(di)       # note: if the dictionary does not exhaustively map all
                         # entries then non-matched entries are changed to NaNs

Example 3: pandas rename column values dictionary

df['col1'].map(di).fillna(df['col1'])