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

Even I am with @DSM for using zfill. But I think using lamba makes it much cleaner and easy to read.

In [1]: import pandas as pd

In [2]: df = pd.DataFrame([45362.0, 75345.0, 346157.0, 572575.0], columns=['code_x'])

In [3]: df.code_x.apply(lambda x: str(int(x)).zfill(6))
Out[3]: 
0    045362
1    075345
2    346157
3    572575
Name: code_x, dtype: object

Note: We are converting a given value to int before converting to string to get rid of ".0" in results.