Add An Index Column Pandas Code Example

Snippet 1
  df.reset_index(level=0, inplace=True) 
Snippet 2
  df = df.set_index('col') 
Snippet 3
  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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