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Replaced boolean tests with is None.

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This commit is contained in:
Raymond Hettinger 2002-06-02 03:04:52 +00:00
parent f13eb55d59
commit 10ff706e27
5 changed files with 14 additions and 14 deletions
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10
Lib/traceback.py
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@ -16,7 +16,7 @@ def _print(file, str='', terminator='\n'):
def print_list(extracted_list, file=None):
"""Print the list of tuples as returned by extract_tb() or
extract_stack() as a formatted stack trace to the given file."""
if not file:
if file is None:
file = sys.stderr
for filename, lineno, name, line in extracted_list:
_print(file,
@ -51,7 +51,7 @@ def print_tb(tb, limit=None, file=None):
'file' should be an open file or file-like object with a write()
method.
"""
if not file:
if file is None:
file = sys.stderr
if limit is None:
if hasattr(sys, 'tracebacklimit'):
@ -116,7 +116,7 @@ def print_exception(etype, value, tb, limit=None, file=None):
occurred with a caret on the next line indicating the approximate
position of the error.
"""
if not file:
if file is None:
file = sys.stderr
if tb:
_print(file, 'Traceback (most recent call last):')
@ -203,7 +203,7 @@ def print_exc(limit=None, file=None):
"""Shorthand for 'print_exception(sys.exc_type, sys.exc_value, sys.exc_traceback, limit, file)'.
(In fact, it uses sys.exc_info() to retrieve the same information
in a thread-safe way.)"""
if not file:
if file is None:
file = sys.stderr
try:
etype, value, tb = sys.exc_info()
@ -214,7 +214,7 @@ def print_exc(limit=None, file=None):
def print_last(limit=None, file=None):
"""This is a shorthand for 'print_exception(sys.last_type,
sys.last_value, sys.last_traceback, limit, file)'."""
if not file:
if file is None:
file = sys.stderr
print_exception(sys.last_type, sys.last_value, sys.last_traceback,
limit, file)