pandas fill na with value from another column
df['Cat1'].fillna(df['Cat2'])
pandas fill na with value from another column
df['Cat1'].fillna(df['Cat2'])
how to fill whole column with same value in oandas
In [194]:
df['A'] = 'foo'
df
Out[194]:
A
0 foo
1 foo
2 foo
3 foo
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