Coyping a folder and renaming file extensions in Python

This script copies myfolder to myfolder2 recursively and renames all .txt files to .xml

#!/usr/bin/env python3
import os
import os.path
import re
import shutil

srcfolder = "myfolder"
dstfolder = "myfolder2"

for subdir, dirs, files in os.walk(srcfolder):
    for file in files:
        # Rename .txt to .xml
        if file.endswith(".txt"):
            dstfile_name = re.sub(r"\.txt$", ".xml", file) # Regex to replace .txt only at the end of the string
            dstfile_name = file
        # Compute destination path
        srcpath = os.path.join(subdir, file)
        dstpath_relative_to_outdir = os.path.relpath(os.path.join(subdir, dstfile_name), start=srcfolder)
        dstpath = os.path.join(dstfolder, dstpath_relative_to_outdir)
        # Create directory if not exists
        os.makedirs(os.path.dirname(dstpath), exist_ok=True)
        # Copy file (copy2 preserves metadata)
        shutil.copy2(srcpath, dstpath)