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4 changes: 3 additions & 1 deletion Lib/warnings.py
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,9 @@ def _formatwarnmsg_impl(msg):
category = msg.category.__name__
s = f"{msg.filename}:{msg.lineno}: {category}: {msg.message}\n"

if msg.line is None:
# "sys" is a made up file name when we are not able to get the frame
# so do not try to get the source line
if msg.line is None and msg.filename != "sys":
try:
import linecache
line = linecache.getline(msg.filename, msg.lineno)
Expand Down
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Do not try to get the source line for made up file name "sys" in :mod:`warnings`.