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warnings.formatwarning(): catch exceptions

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Issue #21925: warnings.formatwarning() now catches exceptions on
linecache.getline(...) to be able to log ResourceWarning emitted late during
the Python shutdown process.
This commit is contained in:
Victor Stinner 2016-03-25 00:30:32 +01:00
parent e0511e797c
commit 27461683a9
3 changed files with 29 additions and 2 deletions
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10
Lib/warnings.py
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@ -21,9 +21,15 @@ def showwarning(message, category, filename, lineno, file=None, line=None):
def formatwarning(message, category, filename, lineno, line=None):
"""Function to format a warning the standard way."""
import linecache
s = "%s:%s: %s: %s\n" % (filename, lineno, category.__name__, message)
line = linecache.getline(filename, lineno) if line is None else line
if line is None:
try:
import linecache
line = linecache.getline(filename, lineno)
except Exception:
# When a warning is logged during Python shutdown, linecache
# and the improt machinery don't work anymore
line = None
if line:
line = line.strip()
s += " %s\n" % line