大约有 47,000 项符合查询结果（耗时：0.0565秒） [XML]
How do I create a list of random numbers without duplicates?
... = f1.readlines()
for i in range(50):
lines = random.sample(all_lines, 40)
This way, you only need to actually read from the file once, before your loop. It's much more efficient to do this than to seek back to the start of the file and call f1.readlines() again for each loop iteration.
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Convert a matrix to a 1 dimensional array
I have a matrix (32X48).
10 Answers
10
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Get name of currently executing test in JUnit 4
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14 Answers
14
Active
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Is arr.__len__() the preferred way to get the length of an array in Python?
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my_list = [1,2,3,4,5]
len(my_list)
# 5
The same works for tuples:
my_tuple = (1,2,3,4,5)
len(my_tuple)
# 5
And strings, which are really just arrays of characters:
my_string = 'hello world'
len(my_string)
# 11
It was intentionally don...
How to change letter spacing in a Textview?
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Joaquin Iurchuk
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answered Feb 27 '11 at 14:13
zrgiuzrgiu
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grep using a character vector with multiple patterns
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edited Jun 8 at 14:03
Henrik
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answ...
How to get numbers after decimal point?
...split('.')[1]
– Ryan Allen
Apr 11 '14 at 18:08
30
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How do you automatically set the focus to a textbox when a web page loads?
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249
If you're using jquery:
$(function() {
$("#Box1").focus();
});
or prototype:
Event.observ...
Regarding 'main(int argc, char *argv[])' [duplicate]
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Ashish Ahuja
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answered Oct 9 '10 at 22:09
FrankFrank
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How to get last key in an array?
... do the trick :
$array = array(
'first' => 123,
'second' => 456,
'last' => 789,
);
end($array); // move the internal pointer to the end of the array
$key = key($array); // fetches the key of the element pointed to by the internal pointer
var_dump($key);
Will outpu...