bpo-33671: allow setting shutil.copyfile() bufsize globally (GH-12016)

3b0abb01 · Giampaolo Rodola · Inada Naoki · ef4ac967 · 3b0abb01
Commit 3b0abb01 authored Feb 24, 2019 by Giampaolo Rodola Committed by Inada Naoki Feb 25, 2019
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Lib/shutil.py Lib/shutil.py +3 -1

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--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -187,9 +187,11 @@ def _copyfileobj_readinto(fsrc, fdst, length=COPY_BUFSIZE):
            else:
                fdst_write(mv)

-def copyfileobj(fsrc, fdst, length=COPY_BUFSIZE):
+def copyfileobj(fsrc, fdst, length=0):
    """copy data from file-like object fsrc to file-like object fdst"""
    # Localize variable access to minimize overhead.
+    if not length:
+        length = COPY_BUFSIZE
    fsrc_read = fsrc.read
    fdst_write = fdst.write
    while True: