大约有 47,000 项符合查询结果（耗时：0.0642秒） [XML]
How to check if std::map contains a key without doing insert?
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310
Use my_map.count( key ); it can only return 0 or 1, which is essentially the Boolean result you...
JavaScript function similar to Python range()
...ay:
range(4) returns [0, 1, 2, 3],
range(3,6) returns [3, 4, 5],
range(0,10,2) returns [0, 2, 4, 6, 8],
range(10,0,-1) returns [10, 9, 8, 7, 6, 5, 4, 3, 2, 1],
range(8,2,-2) returns [8, 6, 4],
range(8,2) returns [],
range(8,2,2) returns [],
range(1,5,-1) returns [],
range(1,5,-2) returns [],
and...
How to check if a function exists on a SQL database
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answered Sep 22 '11 at 10:51
Law MetzlerLaw Metzler
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How to only find files in a given directory, and ignore subdirectories using bash
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answered Oct 10 '11 at 16:03
Mark LongairMark Longair
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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 to pretty-print a numpy.array without scientific notation and with given precision?
...to set the precision of the output:
import numpy as np
x=np.random.random(10)
print(x)
# [ 0.07837821 0.48002108 0.41274116 0.82993414 0.77610352 0.1023732
# 0.51303098 0.4617183 0.33487207 0.71162095]
np.set_printoptions(precision=3)
print(x)
# [ 0.078 0.48 0.413 0.83 0.776 0.10...
How to properly compare two Integers in Java?
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10 Answers
10
Active
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How to check if a user is logged in (how to properly use user.is_authenticated)?
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Update for Django 1.10+:
is_authenticated is now an attribute in Django 1.10.
The method was removed in Django 2.0.
For Django 1.9 and older:
is_authenticated is a function. You should call it like
if request.user.is_authenticated():
# do so...
Test if number is odd or even
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edited Jan 10 '13 at 21:03
Francisco Luz
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Catching error codes in a shell pipe
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answered Feb 10 '11 at 16:13
Michel SamiaMichel Samia
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