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Update shutil.py #5146

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Update shutil.py #5146

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13 changes: 10 additions & 3 deletions Lib/shutil.py
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Original file line number Diff line number Diff line change
Expand Up @@ -75,11 +75,18 @@ class RegistryError(Exception):

def copyfileobj(fsrc, fdst, length=16*1024):
"""copy data from file-like object fsrc to file-like object fdst"""
buf = memoryview(bytearray(length))
# localize
readinto = fsrc.readinto
write = fdst.write
# run loop
while 1:
buf = fsrc.read(length)
if not buf:
recv_len = readinto(buf)
if recv_len < length:
# write remaining content if any.
write(buf[:recv_len])
break
fdst.write(buf)
write(buf)

def _samefile(src, dst):
# Macintosh, Unix.
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