大约有 11,000 项符合查询结果(耗时:0.0230秒) [XML]

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What is the difference between NULL, '\0' and 0?

... actually of type int in C, and thus sizeof('\0') is 4 in my architecture (linux,32bit) – David Rodríguez - dribeas Aug 19 '09 at 8:02 ...
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Operation on every pair of element in a list

Using Python, I'd like to compare every possible pair in a list. 4 Answers 4 ...
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Project structure for Google App Engine

...lt to keep things organized - mainly due to the fact that this is my first python project, and I didn't know anything about it until I started working. ...
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How to split a column into two columns?

...rst two parameters of .str.split() do, I recommend the docs for the plain Python version of the method. But how do you go from: a column containing two-element lists to: two columns, each containing the respective element of the lists? Well, we need to take a closer look at the .str attrib...
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Use cases for the 'setdefault' dict method

The addition of collections.defaultdict in Python 2.5 greatly reduced the need for dict 's setdefault method. This question is for our collective education: ...
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Non-alphanumeric list order from os.listdir()

I often use python to process directories of data. Recently, I have noticed that the default order of the lists has changed to something almost nonsensical. For example, if I am in a current directory containing the following subdirectories: run01, run02, ... run19, run20, and then I generate a list...
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“x not in y” or “not x in y”

... You've run into a CPython peephole optimisation; a compile-time optimisation that other Python implementations such as Jython and IronPython are free to ignore or copy (it is not part of the language specification). – Mart...
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Failed loading english.pickle with nltk.data.load

... I had this same problem. Go into a python shell and type: >>> import nltk >>> nltk.download() Then an installation window appears. Go to the 'Models' tab and select 'punkt' from under the 'Identifier' column. Then click Download and it wil...
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Argparse optional positional arguments?

... @dolan: Yes, + works, too. See docs.python.org/2/library/argparse.html#nargs for the details. – Vinay Sajip Jan 8 '13 at 23:53 2 ...
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Is there a way to provide named parameters in a function call in JavaScript?

... belt. One of my favorite languages that I have had the pleasure to use is Python. Python supports named parameters without any trickery.... Since I started using Python (some time ago) everything became easier. I believe that every language should support named parameters, but that just isn't the c...