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check if SIGINT handler is callable before triggering it...
check if SIGINT handler is callable before triggering it an apparent Python bug can cause `int not callable` when SIGINT handler is SIG_IGN It's a bit baffling that this behavior appears to be dependent on pyzmq version in IPython's own use, but the bug can be reproduced in a tiny amount of pure Python without zmq or IPython.

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tokenize2.py
9 lines | 160 B | text/x-python | PythonLexer
"""Load our patched versions of tokenize.
"""
import sys
if sys.version_info[0] >= 3:
from ._tokenize_py3 import *
else:
from ._tokenize_py2 import *