[issue45756] mock raises exception when using a spec with an attribute that raises exception on access
New submission from Kevin Jamieson :
In Python 3.8 and later creating a mock with a spec specifying an object
containing a property that happens to raise an exception when accessed will
fail, because _mock_add_spec calls getattr() on every attribute of the spec.
This did not happen in Python 3.6/3.7.
This is likely a fairly unusual scenario (and in the particular case where I
encountered this I could just use a class instead of an instance for the spec),
but it was surprising.
For example:
# cat test.py
from unittest import mock
class Foo:
@property
def bar(self) -> str:
raise Exception('xxx')
m = mock.MagicMock(spec=Foo())
# python3.11 test.py
Traceback (most recent call last):
File "/root/test.py", line 8, in
m = mock.MagicMock(spec=Foo())
^^
File "/usr/lib/python3.11/unittest/mock.py", line 2069, in __init__
_safe_super(MagicMixin, self).__init__(*args, **kw)
^^^
File "/usr/lib/python3.11/unittest/mock.py", line 1087, in __init__
_safe_super(CallableMixin, self).__init__(
^^
File "/usr/lib/python3.11/unittest/mock.py", line 442, in __init__
self._mock_add_spec(spec, spec_set, _spec_as_instance, _eat_self)
^
File "/usr/lib/python3.11/unittest/mock.py", line 497, in _mock_add_spec
if iscoroutinefunction(getattr(spec, attr, None)):
^
File "/root/test.py", line 6, in bar
raise Exception('xxx')
^^
Exception: xxx
--
messages: 405982
nosy: kjamieson
priority: normal
severity: normal
status: open
title: mock raises exception when using a spec with an attribute that raises
exception on access
type: behavior
versions: Python 3.10, Python 3.11, Python 3.8, Python 3.9
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[issue45755] Mock spec with a specialized generic class does not mock class attributes
New submission from Kevin Jamieson :
This worked in Python 3.6, but in Python 3.7 and later creating a mock with a
spec specifying a subscripted generic class does not mock any of the attributes
of the class, because those attributes are not returned by dir().
For example:
# cat test.py
from typing import Generic, TypeVar
from unittest import mock
T = TypeVar('T')
class Foo(Generic[T]):
def bar(self) -> None:
pass
m = mock.MagicMock(spec=Foo[int])
m.bar()
# python3.11 test.py
Traceback (most recent call last):
File "/root/test.py", line 11, in
m.bar()
^^^
File "/usr/lib/python3.11/unittest/mock.py", line 635, in __getattr__
raise AttributeError("Mock object has no attribute %r" % name)
^^
AttributeError: Mock object has no attribute 'bar'
--
components: Library (Lib)
messages: 405981
nosy: kjamieson
priority: normal
severity: normal
status: open
title: Mock spec with a specialized generic class does not mock class attributes
type: behavior
versions: Python 3.10, Python 3.11, Python 3.7, Python 3.8, Python 3.9
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tkinter and widget placement after resizing
Hello, I've got a fairly simple GUI that places pmw.EntryFields into a window starting in the upper left corner. When the first column is filled with these widgets I'd like to start a new column and continue placement, and so on. It is working now with the grid manager if I explicitly set the max number of widgets per column, but if I resize the main window there is wasted space as the number of widgets per column is fixed. I'd like to find a design that could change the number of widgets per column when the window is resized. Any suggestions? i.e. start out with a window like this: [1][4][7] [2][5][8] [3][6][9] make the main window larger and end up with this: [1][6] [2][7] [3][8] [4][9] [5] -- http://mail.python.org/mailman/listinfo/python-list
