Create column named “Id” based on row index

Question

I would like to create a new column for my dataframe named \"Id\" where the value is the row index +1. I would like to be like the example below:

   ID  Col         


        

Answer 1

You can add one to the index and assign it to the id column:

df = pd.DataFrame({"Col1": list("abc")})

df["id"] = df.index + 1

df
#Col1   id
#0  a    1
#1  b    2
#2  c    3