Add Two Zeroes in front of file sequence number

Question

I’m fairly new to python and I want to format my filenaming with an extra two zeros infront for single digit and a single zero for 2 digit numbers depending on the file sequence.

My current file naming just renames my file like
ex. 1930L1.mp3

I want it to be 1930L001.mp3

Here is my code

import os

folderPath = r'C:UsersAdministratorDownloads1930'
fileSequence = 1

for filename in os.listdir(folderPath):
    os.rename(folderPath + '\' + filename, folderPath + '\' + '1930L' + str(fileSequence) + '.mp3')
    fileSequence +=1

Asked By: Noscire Designs

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Source

Answer 1

Use str.zfill method to add leading zeroes to your number:

fileSequenceString = str(fileSequence).zfill(3)

As parameter value should be final output string length, so in this case it’s 3.

In your code snippet:

os.rename(folderPath + '\' + filename, folderPath + '\' + '1930L' + str(fileSequence).zfill(3) + '.mp3')

Answered By: Oshawott

Answer 2

You can use Python f-Strings as follows

for i in range(0, 10):
  num = f"{i:03d}"
  fn = "1930L" + num + ".mp3"
  print(fn)

that produces

1930L000.mp3
1930L001.mp3
1930L002.mp3
1930L003.mp3
1930L004.mp3
1930L005.mp3
1930L006.mp3
1930L007.mp3
1930L008.mp3
1930L009.mp3

where

number 0 is for leading zero,
number 3 is for number of digits,
letter d is for decimal integer.

Answered By: dudung

Add Two Zeroes in front of file sequence number

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