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How to get instance variables in Python?
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Every object has a __dict__ variable containing all the variables and its values in it.
Try this
>>> hi_obj = hi()
>>> hi_obj.__dict__.keys()
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How can I dynamically create derived classes from a base class
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This bit of code allows you to create new classes with dynamic
names and parameter names.
The parameter verification in __init__ just does not allow
unknown parameters, if you need other verifications, like
type, or that they ar...
What is the difference between .*? and .* regular expressions?
I'm trying to split up a string into two parts using regex. The string is formatted as follows:
3 Answers
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Creating a dynamic choice field
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you can filter the waypoints by passing the user to the form init
class waypointForm(forms.Form):
def __init__(self, user, *args, **kwargs):
super(waypointForm, self).__init__(*args, **kwargs)
self.fields['waypoints'] = forms.ChoiceField(
choices=[(o.id, ...
UML class diagram enum
...lared an attribute to be of type Integer. If your modeling tool has explicit support for enumerations, you should use that and only use the Class + <<enumeration>> stereotype notation as a fallback if necessary.
– Tom Morris
Feb 2 '12 at 17:11
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Accessing dict keys like an attribute?
I find it more convenient to access dict keys as obj.foo instead of obj['foo'] , so I wrote this snippet:
27 Answers
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Can “using” with more than one resource cause a resource leak?
...lock for each variable.
The spec (§8.13) says:
When a resource-acquisition takes the form of a
local-variable-declaration, it is possible to acquire multiple
resources of a given type. A using statement of the form
using (ResourceType r1 = e1, r2 = e2, ..., rN = eN) statement
is pr...
Run function from the command line
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With the -c (command) argument (assuming your file is named foo.py):
$ python -c 'import foo; print foo.hello()'
Alternatively, if you don't care about namespace pollution:
$ python -c 'from foo import *; print hello()'
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Is module __file__ attribute absolute or relative?
... __file__ is the pathname of the file from which the module was loaded, if it was loaded from a file. The __file__ attribute is not present for C modules that are statically linked into the interpreter; for extension modules loaded dynamically from a shared library, it is the pathname of the shared ...
Python: Bind an Unbound Method?
In Python, is there a way to bind an unbound method without calling it?
5 Answers
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