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import shutil
import sys
def copytree(src, dest, dirs_exist_ok=False):
"""
Helper function to remove existing directories
Used in the tests for compatibility with python < 3.8
"""
if sys.version_info >= (3, 8):
shutil.copytree(src, dest, dirs_exist_ok=dirs_exist_ok)
else:
if dirs_exist_ok:
if not dest.startswith('/tmp'):
raise ValueError("Refusing to delete a directory outside /tmp")
shutil.rmtree(dest)
shutil.copytree(src, dest)
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