Pandas - Add leading “0” to string values so all values are equal len

Question

I have a column, code_x. I converted it to .astype(str). Some example values are 45362.0, 75345.0, 346157.0, 572575.0. I would like them a

Answer 1

You can use the Series.str.rjust method to right justify the string values and use 8 as the length and 0 as fill value. Example -

df3['code_x'] = df3['code_x'].astype(str).str.rjust(8,'0')

Demo -

In [65]: df
Out[65]:
        A
0    blah
1  supbla
2       a

In [69]: df['A'].str.rjust(6,'0')
Out[69]:
0    00blah
1    supbla
2    00000a
Name: A, dtype: object