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App Inventor 2 UrsPahoMqttClient 拓展 - 物...
Using Pairs or 2-tuples in Java [duplicate]
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324
I don't think there is a general purpose tuple class in Java but a custom one might be as easy ...
Rename a dictionary key
... entirely new one using a comprehension.
>>> OrderedDict(zip('123', 'abc'))
OrderedDict([('1', 'a'), ('2', 'b'), ('3', 'c')])
>>> oldkey, newkey = '2', 'potato'
>>> OrderedDict((newkey if k == oldkey else k, v) for k, v in _.viewitems())
OrderedDict([('1', 'a'), ('potat...
How do I get user IP address in django?
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edited May 23 '17 at 10:31
Community♦
111 silver badge
answered Jan 3 '11 at 4:08
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Why should hash functions use a prime number modulus?
...ong time ago, I bought a data structures book off the bargain table for $1.25. In it, the explanation for a hashing function said that it should ultimately mod by a prime number because of "the nature of math".
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A more useful statusline in vim? [closed]
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edited May 9 '16 at 21:49
go2null
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answered ...
How do I write a short literal in C++?
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82
((short)2)
Yeah, it's not strictly a short literal, more of a casted-int, but the behaviour is...
Convert a 1D array to a 2D array in numpy
I want to convert a 1-dimensional array into a 2-dimensional array by specifying the number of columns in the 2D array. Something that would work like this:
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How can I pad a value with leading zeros?
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