Python

    x    y
A  NaN  NaN
B  NaN  NaN
C  NaN  NaN

df.at['C', 'x'] = 10

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

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

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

x.index = index_values

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