how to change the index of a dataframe 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: change dataframe value by index

x    y
A  NaN  NaN
B  NaN  NaN
C  NaN  NaN

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

Example 3: how to change index in dataframe python

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

Example 4: change index to dataframe pandas

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