大约有 800 项符合查询结果（耗时：0.0094秒） [XML]
How can I check if a string represents an int, without using try/except?
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note: u'²'.isdigit() is true but int(u'²') raises ValueError. Use u.isdecimal() instead. str.isdigit() is locale-dependent on Python 2.
– jfs
Oct 19 '14 at 6:02
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On design patterns: When should I use the singleton?
The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design.
19 Answers
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How to convert a string of bytes into an int?
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@Naib, for os.urandom(4) bytes **1.4 µs**(struct) vs **2.3 µs**(int.from_bytes) on my cpu. python 3.5.2
– eri
Dec 26 '16 at 12:32
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Using numpy to build an array of all combinations of two arrays
...%timeit cartesian(([1, 2, 3], [4, 5], [6, 7]))
10000 loops, best of 3: 135 µs per loop
In [114]:
cartesian(([1, 2, 3], [4, 5], [6, 7]))
Out[114]:
array([[1, 4, 6],
[1, 4, 7],
[1, 5, 6],
[1, 5, 7],
[2, 4, 6],
[2, 4, 7],
[2, 5, 6],
[2, 5, 7],
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How do you reverse a string in place in C or C++?
...it, nor the patience to use a hexeditor)
Examples:
$ ./strrev Räksmörgås ░▒▓○◔◑◕●
░▒▓○◔◑◕● ●◕◑◔○▓▒░
Räksmörgås sågrömskäR
./strrev verrts/.
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How to calculate a logistic sigmoid function in Python?
...op
In [7]: %timeit -r 1 logistic.cdf(0.458)
10000 loops, best of 1: 72.2 µs per loop
In [8]: %timeit -r 1 expit(0.458)
100000 loops, best of 1: 2.98 µs per loop
As expected logistic.cdf is (much) slower than expit. expit is still slower than the python sigmoid function when called with a sing...
Difference between datetime and timestamp in sqlserver? [duplicate]
What is the difference between Timestamp and Datetime SQL Server?
2 Answers
2
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How to convert a string to lower or upper case in Ruby
... ÁÂÃÀÇÉÊÍÓÔÕÚ".mb_chars.downcase.to_s
=> "string áâãàçéêíóôõú"
"string áâãàçéêíóôõú".mb_chars.upcase.to_s
=> "STRING ÁÂÃÀÇÉÊÍÓÔÕÚ"
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Inserting a tab character into text using C#
...b + "32"
TextBox2.Text = "Luc" + vbTab + "47"
TextBox3.Text = "François-Victor" + vbTab + "12"
End Sub
will display
as you can see, age value for François-Victor is shifted to the right and is not aligned with age value of two others TextBox.
SOLUTION
To solve this problem, you mus...
Removing duplicates in lists
...ctually true. My timings show that indeed the set is slightly faster: 1.12 µs per loop (set) vs 1.53 µs per loop (dict) over 1M loops with an absolute time difference of about 4s over 1M iterations. So if you're doing this in a tight inner loop you may care, otherwise probably not.
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