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Getting the class name of an instance?
... classes). Your code might use some old-style classes. The following works for both:
x.__class__.__name__
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What does [:] mean?
...f population is a list, this line will create a shallow copy of the list. For an object of type tuple or a str, it will do nothing (the line will do the same without [:]), and for a (say) NumPy array, it will create a new view to the same data.
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Circle line-segment collision detection algorithm?
...the code it seems you have assumed its 1 (so its just "removed"). Do these formulas have a name or something? Maybe I can look them up in detail on Wolfram.
– Mizipzor
Jul 6 '09 at 12:17
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Does Python have an ordered set?
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There is an ordered set (possible new link) recipe for this which is referred to from the Python 2 Documentation. This runs on Py2.6 or later and 3.0 or later without any modifications. The interface is almost exactly the same as a normal set, except that initialisation shoul...
How to dynamically load a Python class
...:
components = name.split('.')
mod = __import__(components[0])
for comp in components[1:]:
mod = getattr(mod, comp)
return mod
The reason a simple __import__ won't work is because any import of anything past the first dot in a package string is an attribute of the module yo...
How to serialize SqlAlchemy result to JSON?
...s some good automatic serialization of ORM models returned from DB to JSON format.
26 Answers
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How to check version of python modules?
... systems, you can pipe this to grep(or findstr on Windows) to find the row for the particular package you're interested in:
Linux:
$ pip freeze | grep lxml
lxml==2.3
Windows:
c:\> pip freeze | findstr lxml
lxml==2.3
For an individual module, you can try the __version__ attribute, however ther...
Short description of the scoping rules?
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Actually, a concise rule for Python Scope resolution, from Learning Python, 3rd. Ed.. (These rules are specific to variable names, not attributes. If you reference it without a period, these rules apply.)
LEGB Rule
Local — Names assigned in any ...
Or versus OrElse
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I never actually knew this was available. Thanks for new information. Good to know, even though I can't really see any situation in which I would want to use "|". I think it would require the second condition to cause side-effects to make any sense, and that in itself makes...
jQuery: How can i create a simple overlay?
...matter if you scroll) and has some sort of opacity.
This will be your CSS for cross browser opacity of 0.5:
#overlay {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #000;
filter:alpha(opacity=50);
-moz-opacity:0.5;
-khtml-opacity...