大约有 40,800 项符合查询结果（耗时：0.0500秒） [XML]
Why are variables “i” and “j” used for counters?
I know this might seem like an absolutely silly question to ask, yet I am too curious not to ask...
23 Answers
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Create Windows service from executable
Is there any quick way to, given an executable file, create a Windows service that, when started, launches it?
8 Answers
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How to fallback to local stylesheet (not script) if CDN fails
...local version of the stylesheet if the CDN fails. For scripts the solution is well known:
11 Answers
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Why is whitespace sometimes needed around metacharacters?
...d the whitespaces, because I think it looks nicer without them. But to my dismay, sometimes (not always) when I run it in a shell it doesn't start a fork bomb, but it just gives a syntax error.
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How to make an immutable object in Python?
Although I have never needed this, it just struck me that making an immutable object in Python could be slightly tricky. You can't just override __setattr__ , because then you can't even set attributes in the __init__ . Subclassing a tuple is a trick that works:
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How to create GUID / UUID?
...all browsers, how "random" and seeded the built-in random number generator is, etc.
55 Answers
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How to ignore xargs commands if stdin input is empty?
Consider this command:
6 Answers
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Removing multiple keys from a dictionary safely
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Why not like this:
entries = ('a', 'b', 'c')
the_dict = {'b': 'foo'}
def entries_to_remove(entries, the_dict):
for key in entries:
if key in the_dict:
del the_dict[key]
A more compact version was provided by matt...
Saving a Numpy array as an image
I have a matrix in the type of a Numpy array. How would I write it to disk it as an image? Any format works (png, jpeg, bmp...). One important constraint is that PIL is not present.
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How can I check if character in a string is a letter? (Python)
I know about islower and isupper , but can you check whether or not that character is a letter?
For Example:
6 Answers
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