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Commitb5a94d8

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Write rewritten code using file.write(marshal.dumps())
This works around the fact that some libraries might monkey patchthe file object, so the previous approach of marshal.dump(co, file)breaks because file is not a built-in file object anymore.Fix#3503
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‎_pytest/assertion/rewrite.py

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -265,10 +265,7 @@ def _write_pyc(state, co, source_stat, pyc):
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mtime=int(source_stat.mtime)
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size=source_stat.size&0xFFFFFFFF
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fp.write(struct.pack("<ll",mtime,size))
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ifsix.PY2:
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marshal.dump(co,fp.file)
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else:
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marshal.dump(co,fp)
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fp.write(marshal.dumps(co))
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exceptEnvironmentErrorase:
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state.trace("error writing pyc file at %s: errno=%s"% (pyc,e.errno))
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# we ignore any failure to write the cache file

‎changelog/3503.bugfix.rst

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
1+
Fix assertion rewriter compatibility with libraries that monkey patch ``file`` objects.

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