make a column the index pandas code example

Example 1: pandas set a column as index

df = pd.DataFrame({'month': [1, 4, 7, 10],
                   'year': [2012, 2014, 2013, 2014],
                   'sale': [55, 40, 84, 31]})

df.set_index('month')

Example 2: pandas create a column from index

df.reset_index(level=0, inplace=True)

Example 3: define a column as index pandas

myDataFrame.set_index('column_name')

Example 4: 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 5: set index in datarame

df = df.set_index('col')

Example 6: how to change index in dataframe python

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