将文件从一个文件夹复制到另一个文件夹（而不是覆盖）

Question

I am using the following code to copy files from one folder to other, but files are getting overwritten, is there anyway to copy files to a new sub folder for each iteration ?

for patients in parent:
    for root, dirnames, filenames in os.walk(patients):
            for filename in fnmatch.filter(filenames, '*.dcm'):
                matches.append(os.path.join(root, filename))

                s=os.path.join(root, filename)
                d =os.path.join(dst, filename)
                shutil.copy(s, d)

Answer 1

You could simply add a check before your copy:

if not os.path.exists(d):
   shutil.copy(s, d)

Answer 2

You can simply use shutil which gives huge amount of choices in order to file operations. Check the documentation here

Code :

import os
import shutil
spath='C:/Path/to/Source'
sfiles = os.listdir(spath)
dpath = 'C:/Path/to/Destination'
for file in sfiles:
if file.endswith('.dcm'):
   shutil.copy(os.path.join(spath,file), os.path.join(dpath,file))

If you have questions and if it doesn't work, please comment below. I have tested it and it works in my system.