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pandas dataframe add column from another column

import pandas as pd

df = pd.DataFrame({'a':[1,2], 'b':[3,4]})
df['c'] = df.apply(lambda row: row.a + row.b, axis=1)
df
#    a  b  c
# 0  1  3  4
# 1  2  4  6

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Adding a new column in pandas dataframe from another dataframe with different index

merge(left, right, how='left', on=None, left_on=None, right_on=None,
      left_index=False, right_index=False, sort=True,
      suffixes=('_x', '_y'), copy=True)

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pandas dataframe add column from another column

Adding a new column in pandas dataframe from another dataframe with different index

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