Adding "." after numbers in filename python

Question

I have a folder with some files. The filenames have the format 123.createtable.txt, 124createtable.txt. I want to remove any whitespace in the filenames and also add a "." after the number sequence if not already present. I'm a little stuck on how to do the latter part.

import os
path = os.getcwd()
filenames = os.listdir(path) # Returns a list of the files of the directory given by path
for filename in filenames: # For each of the files
    if "." not in filename:
        filename.append (".")
    os.rename(os.path.join(path, filename), os.path.join(path, filename.replace(' ', ''))) # Remove whitespace from filename

Use a regular expression to match the number, and replace it with the matched value and a . — Barmar
– Barmar, Commented Nov 21, 2016 at 17:50
Your indentation is wrong. The if statement should be indented 4 more spaces. — Sumner Evans
– Sumner Evans, Commented Nov 21, 2016 at 17:50

caspillaga · Accepted Answer · 2016-11-21 18:22:34Z

2

This code is far from oprimal, but should do the trick:

import os
path = os.getcwd()
filenames = os.listdir(path) # Returns a list of the files of the directory given by path
for filename in filenames: # For each of the files
    newFilename = ""
    for i in range(len(filename)-1):
        if filename[i] in '0123456789' and filename[i+1] not in '0123456789.':
            newFilename = newFilename + filename[i] + '.'
        else:
            newFilename = newFilename + filename[i]
    newFilename = newFilename + filename[-1]
    newFilename = newFilename.replace(' ','')    
    os.rename(os.path.join(path, filename), os.path.join(path, newFilename))

edited Nov 21, 2016 at 18:22

answered Nov 21, 2016 at 17:59

caspillaga

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Comments

LycuiD · Accepted Answer · 2016-11-21 18:12:33Z

0

use regex:

import re
pat = re.compile(r"(\d+)") # pattern for "digits" match

and then use the pattern to substitute it with "." after using re.sub:

for filename in filenames:
    if any(str(x) in filename for x in list(range(10))):
        newname = re.sub(pat, "\\1.", filename)  # sub numbers
        newname = re.sub(" ", "", newname)       # sub whitespaces
    os.rename(filename, newname)

edited Nov 21, 2016 at 18:12

answered Nov 21, 2016 at 18:03

LycuiD

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