Answers for "pandas change row value based on condition"

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

set value based on column

df.loc[df['c1'] == 'Value', 'c2'] = 10