Python - how to reset the order of number in the column data frame name pandas?

Question

here is my data frame

Student_Id St_Name
1          John
2          Mark
3          Zen
4          David
5          Max
6          Sanny
7          Seolla

and I have removed sum number in this data frame

Student_Id St_Name
2          Mark
4          David
5          Max
7          Seolla

but i would like to re-order it. and the expectation of this output will be

Student_Id St_Name
    1          Mark
    2          David
    3          Max
    4          Seolla

I have tried df.Student_Id.reset_index(). but, it's not working.

Answer 1

Use:

df['Student_Id'] = df.reset_index().index + 1
df

Student_Id  St_Name
1   Mark
2   David
3   Max
4   Seolla

OR

df['Student_Id'] = range(1, df.shape[0]+1)