find and replace string dataframe
df['range'] = df['range'].str.replace(',','-')
                                
                            find and replace string dataframe
df['range'] = df['range'].str.replace(',','-')
                                
                            pandas replace values in column based on condition
In [41]:
df.loc[df['First Season'] > 1990, 'First Season'] = 1
df
Out[41]:
                 Team  First Season  Total Games
0      Dallas Cowboys          1960          894
1       Chicago Bears          1920         1357
2   Green Bay Packers          1921         1339
3      Miami Dolphins          1966          792
4    Baltimore Ravens             1          326
5  San Franciso 49ers          1950         1003
                                
                            pandas replace values based on condition
df.loc[df['First Season'] > 1990, 'First Season'] = 1
                                
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