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how to set index pandas

# assignment copy
df = df.set_index('month')

# or inplace
df.set_index('month', inplace=True)

#      year   sale  month            month  year   sale
#  0   2012   55    1                1      2012   55
#  1   2014   40    4       =>       4      2014   40
#  2   2013   84    7                7      2013   84
#  3   2014   31    10               10     2014   31
Comment

how to change index in dataframe python

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

change index to dataframe pandas

#cree un indice par defaut sur la base de donnee
df.reset_index()
Comment

dataframe change index

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

series change index pandas

x.index = index_values
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