how to copy all csv files from different source folders into target as per source folders using python?

Question

I have code as below to copy all *.csv files from different source folders, but i want to copy in different folders as per source, i could able to copy all csv files to single folder but i want it into different folders as source folders.

import os
import shutil
import fnmatch

dir = 'C:\\data\\projects\\'
patterns = ['project1','project2']
dest = 'D:\\data\\projects\\'

for root, dirs, files in os.walk(dir):

    for pattern in patterns:

        for filename in fnmatch.filter(files, '*.csv'):
            source = (os.path.join(root, filename))
            print(source)
            shutil.copy(source, dest)

Answer 1

You could use os.path.relpath to extract the subpath for a general method, and os.makedirs to create missing directories on the destination:

    ...
    for filename in fnmatch.filter(files, '*.csv'):
        source = (os.path.join(root, filename))
        print(source)
        rel = os.path.relpath(root, dir)
        curdest = os.path.join(dest, rel)
        if not os.path.exists(curdest):
            os.makedirs(curdest, exist_ok=True)
        shutil.copy(source, curdest)