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How to test if a string is basically an integer in quotes using Ruby
...ay:
class String
def is_integer?
self.to_i.to_s == self
end
end
>> "12".is_integer?
=> true
>> "blah".is_integer?
=> false
I don't agree with the solutions that provoke an exception to convert the string - exceptions are not control flow, and you might as well do it the...
How to install multiple python packages at once using pip
...u put your modules in a list, with one item per line.
Django=1.3.1
South>=0.7
django-debug-toolbar
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IntelliJ beginning of file keyboard shortcut
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Edit the Intellij Preferences -> KeyMap -> Editor Actions entries for "Move Caret to Text Start" and "Move Caret to Text End". If you set those to Command+UpArrow and Command+DownArrow, it'll work like a normal text editor. I have no idea why that i...
Python, remove all non-alphabet chars from string
...
You can use the re.sub() function to remove these characters:
>>> import re
>>> re.sub("[^a-zA-Z]+", "", "ABC12abc345def")
'ABCabcdef'
re.sub(MATCH PATTERN, REPLACE STRING, STRING TO SEARCH)
"[^a-zA-Z]+" - look for any group of characters that are NOT
a-zA-z.
"" - R...
How to allow keyboard focus of links in Firefox?
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10.9 Mavericks: System Preferences > Keyboard > Shortcuts > 'All controls' radio button at the bottom of the pane.
– paulhhowells
Oct 16 '14 at 10:22
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What does it mean: The serializable class does not declare a static final serialVersionUID field? [d
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@JediKnight In Eclispse it is Window>Preferences>Java>Code Style>Clean Up>Missing Code>activate "Add serial version ID" under "Potential programming problems". Then if you are in the default profile, obviously you must save it as a different o...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...mp;x; // get bits for floating value
i = 0x5f375a86 - (i >> 1); // gives initial guess y0
x = *(float*)&i; // convert bits back to float
x = x * (1.5f - xhalf * x * x); // Newton step, repeating increases accuracy
return x;
}
In spite of t...
What is the difference between concurrent programming and parallel programming?
...eads on a non-threaded machine:
-- -- --
/ \
>---- -- -- -- -- ---->>
Threads on a threaded machine:
------
/ \
>-------------->>
The dashes represent executed code. As you can see, they both split up and execute separately, but th...
How do you determine the ideal buffer size when using FileInputStream?
...he blocks are already in cache, then you wind up paying the price of RAM -> L3/L2 cache latency. If you are unlucky and the blocks are not in cache yet, the you pay the price of the disk->RAM latency as well.
This is why you see most buffers sized as a power of 2, and generally larger than (...
How to replace multiple substrings of a string?
...= pattern.sub(lambda m: rep[re.escape(m.group(0))], text)
For example:
>>> pattern.sub(lambda m: rep[re.escape(m.group(0))], "(condition1) and --condition2--")
'() and --text--'
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