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Python memoising/deferred lookup property decorator
...lf))
return getattr(self, attr_name)
return _lazyprop
class Test(object):
@lazyprop
def a(self):
print 'generating "a"'
return range(5)
Interactive session:
>>> t = Test()
>>> t.__dict__
{}
>>> t.a
generating "a"
[0, 1, 2, 3, 4]
&...
How to get current CPU and RAM usage in Python?
...s more concepts and interest concepts:
https://psutil.readthedocs.io/en/latest/
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What is the difference between _tmain() and main() in C++?
...2013:
Changed the traditional "TCHAR" to "_TCHAR" which seems to be the latest fashion. Both work fine.
End Update
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boost::flat_map and its performance compared to map and unordered_map
...dering of instructions.
3) parameters
The last problem is people usually test for too few variations of the scenario.
A container performance is affected by:
Allocator
size of contained type
cost of implementation of copy operation, assignment operation, move operation, construction operation, o...
How to do relative imports in Python?
...
then, one day, need to change name of app to test_app. what would happen? You will need to change all the source codes, import app.package_b.module_b --> test_app.package_b.module_b. this is absolutely BAD practice... And we should try to use relative import within t...
Python list directory, subdirectory, and files
...strings like ~/
Extending this example:
Its easy to add in file basename tests and directoryname tests.
For Example, testing for *.jpg files:
... for j in i[2] if j.endswith('.jpg')] ...
Additionally, excluding the .git directory:
... for i in os.walk('./') if '.git' not in i[0].split('/')]
...
Can modules have properties the same way that objects can?
... @property
def y(self):
return 5
>>> a=MyModule("test")
>>> a
<module 'test' (built-in)>
>>> a.y
5
And then you can insert this into sys.modules:
sys.modules[__name__] = MyModule(__name__) # remember to instantiate the class
...
How do I specify a single test in a file with nosetests?
I have a file called test_web.py containing a class TestWeb and many methods named like test_something().
6 Answers
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In Python, how do I read the exif data for an image?
...
Can you test this on this Question, download the images, and try to get the ImageDescription. stackoverflow.com/questions/22173902/…
– A.J.
Mar 6 '14 at 7:21
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How do you test that a Python function throws an exception?
How does one write a unittest that fails only if a function doesn't throw an expected exception?
13 Answers
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