大约有 44,500 项符合查询结果（耗时：0.0487秒） [XML]
In C/C++ what's the simplest way to reverse the order of bits in a byte?
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How to secure MongoDB with username and password
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You need to start mongod with the --auth option after setting up the user.
From the MongoDB Si...
How do you get the width and height of a multi-dimensional array?
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You use Array.GetLength with the index of the dimension you wish to retrieve.
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What makes Lisp macros so special?
...for a common case. The line
divisibleByTwo = [x for x in range(10) if x % 2 == 0]
yields a list containing all even numbers between 0 and 9. Back in the Python 1.5 days there was no such syntax; you'd use something more like this:
divisibleByTwo = []
for x in range( 10 ):
if x % 2 == 0:
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Painless way to install a new version of R?
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edited May 8 '19 at 2:46
Gregor Thomas
91.9k1515 gold badges126126 silver badges235235 bronze badges
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How do I determine the target architecture of static library (.a) on Mac OS X?
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Another option is lipo; its output is brief and more readable than otool's.
An example:
% li...
How to import multiple .csv files at once?
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Something like the following should result in each data frame as a separate element in a singl...
Insert, on duplicate update in PostgreSQL?
...ing syntax (similar to MySQL)
INSERT INTO the_table (id, column_1, column_2)
VALUES (1, 'A', 'X'), (2, 'B', 'Y'), (3, 'C', 'Z')
ON CONFLICT (id) DO UPDATE
SET column_1 = excluded.column_1,
column_2 = excluded.column_2;
Searching postgresql's email group archives for "upsert" leads to...
How does Python manage int and long?
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int and long were "unified" a few versions back. Before that it was possible to overflow an int...
Why does Python print unicode characters when the default encoding is ASCII?
From the Python 2.6 shell:
6 Answers
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