大约有 42,000 项符合查询结果（耗时：0.0783秒） [XML]
How to efficiently build a tree from a flat structure?
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123
Store IDs of the objects in a hash table mapping to the specific object. Enumerate through all t...
How do I access this object property with an illegal name?
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263
<?php
$x = new StdClass();
$x->{'todo-list'} = 'fred';
var_dump($x);
So, $object->{'to...
How to set warning level in CMake?
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mloskotmloskot
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Adding a user to a group in django
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juankysmithjuankysmith
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17
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Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?
...T you won't need to specify the dtype)
In [24]: s = Series([Timestamp('20130101'),np.nan,Timestamp('20130102 9:30')],dtype='M8[ns]')
In [25]: s
Out[25]:
0 2013-01-01 00:00:00
1 NaT
2 2013-01-02 09:30:00
dtype: datetime64[ns]``
In [26]: pd.isnull(s)
Out[26]:
0 False
1 ...
Break a previous commit into multiple commits
...everal choices:
If it was three commits back, then
$ git rebase -i HEAD~3
where 3 is how many commits back it is.
If it was farther back in the tree than you want to count, then
$ git rebase -i 123abcd~
where 123abcd is the SHA1 of the commit you want to split up.
If you are on a different b...
What is __gxx_personality_v0 for?
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93
It is used in the stack unwiding tables, which you can see for instance in the assembly output o...
Record file copy operation with Git
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edited Aug 31 '15 at 20:06
Cristian Ciupitu
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How do I check the difference, in seconds, between two dates?
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536
if you want to compute differences between two known dates, use total_seconds like this:
impor...
Extracting extension from filename in Python
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Yes. Use os.path.splitext(see Python 2.X documentation or Python 3.X documentation):
>>> import os
>>> filename, file_extension = os.path.splitext('/path/to/somefile.ext')
>>> filename
'/path/to/somefile'
>>> file_extension
'.ext'
Unlike most manual s...