How do I copy an entire directory of files into an existing directory using Python?

Here's a solution that's part of the standard library:

from distutils.dir_util import copy_tree
copy_tree("/a/b/c", "/x/y/z")

See this similar question.

Copy directory contents into a directory with python

• Reference - https://docs.python.org/3/distutils/apiref.html#distutils.dir_util.copy_tree

This limitation of the standard shutil.copytree seems arbitrary and annoying. Workaround:

import os, shutil
def copytree(src, dst, symlinks=False, ignore=None):
    for item in os.listdir(src):
        s = os.path.join(src, item)
        d = os.path.join(dst, item)
        if os.path.isdir(s):
            shutil.copytree(s, d, symlinks, ignore)
        else:
            shutil.copy2(s, d)

Note that it's not entirely consistent with the standard copytree:

• it doesn't honor symlinks and ignore parameters for the root directory of the src tree;
• it doesn't raise shutil.Error for errors at the root level of src;
• in case of errors during copying of a subtree, it will raise shutil.Error for that subtree instead of trying to copy other subtrees and raising single combined shutil.Error.

Python 3.8 introduced the dirs_exist_ok argument to shutil.copytree:

Recursively copy an entire directory tree rooted at src to a directory named dst and return the destination directory. dirs_exist_ok dictates whether to raise an exception in case dst or any missing parent directory already exists.

Therefore, with Python 3.8+ this should work:

import shutil

shutil.copytree('bar', 'foo')
shutil.copytree('baz', 'foo', dirs_exist_ok=True)