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Here's is an os.scandir(path='.') implementation that iterates reading the directory on the fly instead of pre-building a list.
os.listdir's implementation should ultimately be replaced by this as:
def listdir(path=None):
 if path is None:
 return list(os.scandir())
 return list(os.scandir(path))
Though I have not yet done that in this patch so that I could compare behavior of old vs new.
Why the scandir name? Read the libc scandir man page. It fits.
I have tested this on POSIX (Linux). I don't have any ability to build Windows code so I expect that still has bugs and possibly compilation issues. Please leave comments on the 'review' link.