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import os
import sys
import site
from sysconfig import get_path
if __name__ == '__main__':
prefix = sys.argv[1]
#ask sysconfig where to install the python module
install_dir = get_path('platlib', 'posix_user', {'userbase': prefix})
#use sites when the prefix is already recognized
try:
paths = [p for p in site.getsitepackages() if p.startswith(prefix)]
if len(paths) == 1: install_dir = paths[0]
except AttributeError: pass
#strip the prefix to return a relative path
print(os.path.relpath(install_dir, prefix))
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