Answers for "set index pandas"

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

set index to column pandas

df = df.set_index('col')
df['col'] = df.index

pandas create a column from index

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

set index in datarame

df = df.set_index('col')

pandas df make set index column

df.reset_index(inplace=True)
df = df.rename(columns = {'index':'new column name'})

add an index column pandas

import numpy as np
import pandas as pd
df = pd.DataFrame({'month': [2, 5, 8, 10],
                   'year': [2017, 2019, 2018, 2019],
                   'sale': [60, 45, 90, 36]})
df.set_index('month')