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Close #19379: Lazily import linecache in the warnings module, to make startup with warnings faster until a warning gets printed.

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This commit is contained in:
Antoine Pitrou 2013-10-24 22:23:42 +02:00
parent f740d467bf
commit 7cb11fa890
2 changed files with 5 additions and 4 deletions
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6
Lib/warnings.py
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@ -1,9 +1,5 @@
"""Python part of the warnings subsystem."""
# Note: function level imports should *not* be used
# in this module as it may cause import lock deadlock.
# See bug 683658.
import linecache
import sys
__all__ = ["warn", "showwarning", "formatwarning", "filterwarnings",
@ -21,6 +17,7 @@ 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:
@ -233,6 +230,7 @@ def warn_explicit(message, category, filename, lineno,
# Prime the linecache for formatting, in case the
# "file" is actually in a zipfile or something.
import linecache
linecache.getlines(filename, module_globals)
if action == "error":