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How does grep run so fast?
...omparison
# (everything is in the buffer cache)
$ time grep -c 'tg=f_c' 20140910.log
28
0.168u 0.068s 0:00.26
$ time grep -c ' /cc/merchant.json tg=f_c' 20140910.log
28
0.100u 0.056s 0:00.17
The longer form is 35% faster!
How come? Boyer-Moore consructs a skip-forward table from the pattern-st...
Python: changing value in a tuple
...d to ask, why you want to do this?
But it's possible via:
t = ('275', '54000', '0.0', '5000.0', '0.0')
lst = list(t)
lst[0] = '300'
t = tuple(lst)
But if you're going to need to change things, you probably are better off keeping it as a list
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How do I specify a single test in a file with nosetests?
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answered Jul 2 '12 at 0:58
WillWill
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Select random lines from a file
... |
edited Jun 16 '16 at 20:48
DomainsFeatured
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an...
Pure virtual destructor in C++
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220
Yes. You also need to implement the destructor:
class A {
public:
virtual ~A() = 0;
};
inl...
Best way to reverse a string
I've just had to write a string reverse function in C# 2.0 (i.e. LINQ not available) and came up with this:
48 Answers
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Most efficient way to remove special characters from string
...om a string. Allowed characters are A-Z (uppercase or lowercase), numbers (0-9), underscore (_), or the dot sign (.).
24 An...
My docker container has no internet
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110
First thing to check is run cat /etc/resolv.conf in the docker container. If it has an invalid D...
Can the jQuery UI Datepicker be made to disable Saturdays and Sundays (and holidays)?
...
The function takes a date as a parameter and must return an array with [0] equal to true/false indicating whether or not this date is selectable and 1 equal to a CSS class name(s) or '' for the default presentation. It is called for each day in the datepicker before is it displayed.
Display some...
valueOf() vs. toString() in Javascript
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107
The reason why ("x="+x) gives "x=value" and not "x=tostring" is the following. When evaluating ...