大约有 43,100 项符合查询结果（耗时：0.0393秒） [XML]
Listing all permutations of a string/integer
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158
First of all: it smells like recursion of course!
Since you also wanted to know the principle,...
Select multiple columns in data.table by their numeric indices
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185
For versions of data.table >= 1.9.8, the following all just work:
library(data.table)
dt &...
Performance of foreach, array_map with lambda and array_map with static function
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122
FWIW, I just did the benchmark since poster didn't do it. Running on PHP 5.3.10 + XDebug.
UP...
How to atomically delete keys matching a pattern using Redis
...g like this
EVAL "return redis.call('del', unpack(redis.call('keys', ARGV[1])))" 0 prefix:[YOUR_PREFIX e.g delete_me_*]
Warning: As the Redis document says, because of performance maters, keys
command should not use for regular operations in production, this
command is intended for debuggi...
`elif` in list comprehension conditionals
...essions were designed exactly for this sort of use-case:
>>> l = [1, 2, 3, 4, 5]
>>> ['yes' if v == 1 else 'no' if v == 2 else 'idle' for v in l]
['yes', 'no', 'idle', 'idle', 'idle']
Hope this helps :-)
s...
Set Matplotlib colorbar size to match graph
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198
You can do this easily with a matplotlib AxisDivider.
The example from the linked page also w...
Is unsigned integer subtraction defined behavior?
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107
The result of a subtraction generating a negative number in an unsigned type is well-defined:
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How can I find the length of a number?
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13 Answers
13
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Commenting multiple lines in DOS batch file
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185
You can use a goto to skip over code.
goto comment
...skip this...
:comment
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