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Does List guarantee insertion order?
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edited Dec 20 '17 at 13:22
UuDdLrLrSs
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Can a class member function template be virtual?
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answered Mar 1 '10 at 8:52
sbisbi
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How can I see the size of files and directories in linux? [closed]
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answered Jul 30 '12 at 10:59
mk..mk..
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Test whether string is a valid integer
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[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a literal "-"
The ? means "0 or 1 of the preceding (-)"
The + means "1 or more of the preceding ([0-9])"
The $ indicates the end of the input pattern
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How to index into a dictionary?
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110
Dictionaries are unordered in Python versions up to and including Python 3.6. If you do not car...
Get Image size WITHOUT loading image into memory
...e operations in the source like:
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prefix = fp.read(16)
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fp.seek(0)
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but these hardly constitute reading the whole file. In fact .open simply returns a file object and the filename on success. In addition the docs say:
open(file, mode=”r”)
Opens and identifies the given ...
Why prefer two's complement over sign-and-magnitude for signed numbers?
..., 2 and -1. In your "intuitive" way of representing numbers, they would be 0010 and 1001, respectively (I'm sticking to 4 bits for size). In the two's complement way, they are 0010 and 1111. Now, let's say I want to add them.
Two's complement addition is very simple. You add numbers normally and an...
Is Big O(logn) log base e?
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edited Feb 15 '10 at 5:23
community wiki
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typecast string to integer - Postgres
...lesced field such as, for example:-
SELECT CAST(coalesce(<column>, '0') AS integer) as new_field
from <table>
where CAST(coalesce(<column>, '0') AS integer) >= 10;
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im...
cannot load such file — zlib even after using rvm pkg install zlib
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201
I ended up installing zlib from apt-get and then reinstalling ruby to not use the rvm directory...