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java.lang.NoClassDefFoundError: Could not initialize class XXX
...ing) and still found nothing.
So, I try to find the difference between the linux machine and my computer. Then I found that this problem happens only when several threads run in one process(By the way, the linux machine has double cores and double processes). That means if there are two tasks(both u...
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...
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]
...
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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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 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...
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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Flattening a shallow list in Python [duplicate]
... hadn't heard from from_iterable. it's prettier than the *, if less pythonic
– Jules G.M.
Mar 29 '16 at 22:04
1
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How to count the number of files in a directory using Python
I need to count the number of files in a directory using Python.
24 Answers
24
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