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Preserving signatures of decorated functions
...ule __main__:
#
# funny_function(x, y, z=3)
# Computes x*y + 2*z
Python 3.4+
functools.wraps() from stdlib preserves signatures since Python 3.4:
import functools
def args_as_ints(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
args = [int(x) for x in args]
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How to implement __iter__(self) for a container object (Python)
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StopIteration is automatically raised by Python when the generator function returns, either by you explicitly calling return or by reaching the end of the function (which like all functions has an implicit return None at the end). Explicitly raising StopIteration is...
Standard way to embed version into python package?
Is there a standard way to associate version string with a python package in such way that I could do the following?
17 Ans...
How to install lxml on Ubuntu
...elopment packages using apt-get.
apt-get install libxml2-dev libxslt1-dev python-dev
If you're happy with a possibly older version of lxml altogether though, you could try
apt-get install python-lxml
and be done with it. :)
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How do I get the number of elements in a list?
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The len() function can be used with several different types in Python - both built-in types and library types. For example:
>>> len([1,2,3])
3
Official 2.x documentation is here: len()
Official 3.x documentation is here: len()
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Get the first item from an iterable that matches a condition
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In Python 2.6 or newer:
If you want StopIteration to be raised if no matching element is found:
next(x for x in the_iterable if x > 3)
If you want default_value (e.g. None) to be returned instead:
next((x for x in the_it...
setuptools: package data folder location
I use setuptools to distribute my python package. Now I need to distribute additional datafiles.
3 Answers
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How do you append to a file in Python?
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Python has many variations off of the main three modes, these three modes are:
'w' write text
'r' read text
'a' append text
So to append to a file it's as easy as:
f = open('filename.txt', 'a')
f.write('whatever yo...
how to split the ng-repeat data with three columns using bootstrap
... answered May 8 '15 at 16:18
Stéphane GRILLONStéphane GRILLON
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How to print instances of a class using print()?
I am learning the ropes in Python. When I try to print an object of class Foobar using the print() function, I get an output like this:
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