pandas create a column from index
df.reset_index(level=0, inplace=True)
pandas create a column from index
df.reset_index(level=0, inplace=True)
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')
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