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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...
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
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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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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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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
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NameError: name 'reduce' is not defined in Python
I'm using Python 3.2. Tried this:
5 Answers
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How to randomly select an item from a list?
...orrect', 'horse', 'staple']
print(secrets.choice(foo))
secrets is new in Python 3.6, on older versions of Python you can use the random.SystemRandom class:
import random
secure_random = random.SystemRandom()
print(secure_random.choice(foo))
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如何获取IE (控件)的所有链接（包括Frameset, iframe） - 其他 - 清泛IT社...
...) 里面的节点列表的话, 则需要根据body/doc 找到frames, 然后从frames -> IHTMLWindow2 -> IHTMLDocument2 . 主要有2个方法, 下面是代码片段
方法一：
IHTMLDocument2 *pDoc = 浏览器的Document(IWebBrowser2->IDispatch->IHTMLDocument2);
IHTMLWindow2 *pHTMLWnd ...
Get loop count inside a Python FOR loop
In a Python for loop that iterates over a list we can write:
5 Answers
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