Hướng dẫn scandir recursive python

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Python 3.5's os.scandir[path] function returns lightweight DirEntry objects that are very helpful with information about files. However, it only works for the immediate path handed to it. Is there a way to wrap it in a recursive function so that it visits all subdirectories beneath the given path?

Ben Hoyt

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asked Oct 14, 2015 at 20:31

1

You can scan recursively using os.walk[], or if you need DirEntry objects or more control, write a recursive function like scantree[] below:

try:
    from os import scandir
except ImportError:
    from scandir import scandir  # use scandir PyPI module on Python < 3.5

def scantree[path]:
    """Recursively yield DirEntry objects for given directory."""
    for entry in scandir[path]:
        if entry.is_dir[follow_symlinks=False]:
            yield from scantree[entry.path]  # see below for Python 2.x
        else:
            yield entry

if __name__ == '__main__':
    import sys
    for entry in scantree[sys.argv[1] if len[sys.argv] > 1 else '.']:
        print[entry.path]

Notes:

• There are a few more examples in PEP 471 and in the os.scandir[] docs.
• You can also add various logic in the for loop to skip directories or files starting with '.' and that kind of thing.
• You typically want follow_symlinks=false on the is_dir[] calls in recursive functions like this, to avoid symlink loops.

• On Python 2.x, replace the yield from line with:

  for entry in scantree[entry.path]:
      yield entry
  

answered Oct 14, 2015 at 20:38

Ben HoytBen Hoyt

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