python use column as index code example

Example 1: how to change indeces in pandas dataframe

>>> df.set_index('month')
       year  sale
month
1      2012    55
4      2014    40
7      2013    84
10     2014    31

Example 2: set index in datarame

df = df.set_index('col')

Example 3: how to change index in dataframe python

index = [1,2]
df.index = index