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I have a number of image files stored as 0.png, 1.png, ..., x.png in a folder. I have to rename then in the opposite order, i.e. 0->x, 1->(x-1), .., (x-1)->1, x->0. I have written the following code in python.

for filename in os.listdir("."):
    tempname = "t" + filename
    os.rename(filename, tempname)
for x in range(minx, maxx+1):
    tempname = "t" + str(x) + ".png"
    newname = str(maxx-x) + ".png"
    os.rename(tempname, newname)

I encounter the following error:

OSError: [Errno 2] No such file or directory

What am I doing wrong? Is there a smarter way of doing this?

nirupma
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1 Answers1

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Try the following, it uses the glob module to get the file list. This should include the full path otherwise os.rename could fail:

import glob
import os

source_files = glob.glob(r'myfolder\mytestdir\*')
temp_files = ['{}.temp'.format(file) for file in source_files]
target_files = source_files[::-1]

for source, temp in zip(source_files, temp_files):
    os.rename(source, temp)

for temp, target in zip(temp_files, target_files):
    os.rename(temp, target)

Note, if you want to target just .png files, you could change the glob line to be *.png

Martin Evans
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