如何复制具有特定扩展名的文件夹目录中的文件，然后将其保存到新文件夹中而不覆盖已复制的文件？

Question

Here is the code I am working on:

from qgis.core import*
import glob, os, shutil, time, qgis

path = r"C:\Temp\testinput"
dest = r"C:\Temp\testoutput"

fname = []
for root,d_names,f_names in os.walk(path):
    for f in f_names:
        if f.endswith('.kml'):
            src = os.path.join(root,f)
            print(time.strftime('%m/%d/%Y', time.gmtime(os.path.getmtime(src))))
            print(os.path.realpath(src))
            shutil.copy2(src, dest)

this code transverses through the directory and copies the files but does overwrites files with the same name. How do I prevent the overwriting part? I would like to have the same type of filed renamed to "filename-copy" if it catches a file with the same name in the new folder.

Answer 1

Very quick answer;

If the extension is known, it is not that hard. You can check upfront if a file exists. By adding something like this

exists = os.path.isfile(dest)
if exists:
    os.rename(dest , dest.replace('.kml', '-copy.kml'))

So the entire thing looks like this:

from qgis.core import*
import glob, os, shutil, time, qgis

path = r"C:\Temp\testinput"
dest = r"C:\Temp\testoutput"

fname = []
for root,d_names,f_names in os.walk(path):
    for f in f_names:
        if f.endswith('.kml'):
            src = os.path.join(root,f)
            print(time.strftime('%m/%d/%Y', time.gmtime(os.path.getmtime(src))))
            print(os.path.realpath(src))
            exists = os.path.isfile(dest)
            if exists:
                os.rename(dest , dest.replace('.kml', '-copy.kml'))
            shutil.copy2(src, dest)

Not so very quick answer;

But, this assumes that the "file-copy.kml" does not already exist. If you want to keep an X amount of copies, perhaps rename them differently. In that case, I would advice something like this:

    exists = os.path.isfile(dest)
    if exists:
        os.rename(dest , dest.replace('.kml', '-copy_'+id_generator()+'.kml'))

Where you place this someplace at the top of your file.

import string
import random
def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))

Where I have borrowed the function that generates some random characters from this question; Random string generation with upper case letters and digits in Python