New submission from Ismael Garrido <ismael...@gmail.com>:
Using the "with" statement wrongly results in a confusing error message.
Code (originally written by Alex Gaynor):
class Timer(object):
def __enter__(self):
self.start = time.time()
def __exit__(self, exc_type, exc_val, tb):
print "Section time: ", time.time() - self.start
#Note the error here, I call the class, not an instance
with Timer:
pass
------------------------
Compare the Python 2.6 error:
ismael@chaos:~/Escritorio$ python bad.py
Traceback (most recent call last):
File "bad.py", line 8, in <module>
with Timer:
TypeError: unbound method __enter__() must be called with Timer instance as
first argument (got nothing instead)
Against Python 2.7:
ismael@chaos:~/Escritorio$ python2.7 bad.py
Traceback (most recent call last):
File "bad.py", line 8, in <module>
with Timer:
AttributeError: __exit__
----------
components: Interpreter Core
messages: 139918
nosy: Ismael.Garrido
priority: normal
severity: normal
status: open
title: "with" statement error message is more confusing in Py2.7
type: behavior
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12503>
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