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PostgreSQL LIKE query performance variations
...E operator at all, it has its own operators and doesn't work for arbitrary strings. It operates on words based on dictionaries and stemming. It does support prefix matching for words, but not with the LIKE operator:
Get partial match from GIN indexed TSVECTOR column
Trigram indexes for LIKE
Ins...
Python str vs unicode types
...unicode instead of str , as both of them seem to be able to hold Unicode strings. Is there any special reason apart from being able to set Unicode codes in unicode strings using the escape char \ ?:
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Is there a way to perform “if” in python's lambda
...eason to use a lambda, period. Assigning a lambda to a variable -- as a stand-in for def -- is generally a Very Bad Idea (tm). Just use a def so mere mortal programmers can read, interpret, understand and maintain it.
– S.Lott
Oct 18 '09 at 22:15
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How can I specify a [DllImport] path at runtime?
...t = CharSet.Auto, SetLastError = true)]
static extern bool SetDllDirectory(string lpPathName);
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What's the nearest substitute for a function pointer in Java?
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Anonymous inner class
Say you want to have a function passed in with a String param that returns an int.
First you have to define an interface with the function as its only member, if you can't reuse an existing one.
interface StringFunction {
int func(String param);
}
A method that takes...
Convert integer to hexadecimal and back again
...Store integer 182
int intValue = 182;
// Convert integer 182 as a hex in a string variable
string hexValue = intValue.ToString("X");
// Convert the hex string back to the number
int intAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);
from http://www.geekpedia.com/KB8_How-d...
C/C++ check if one bit is set in, i.e. int variable
... there such a way to check if bit 3 in temp is 1 or 0 without bit shifting and masking.
21 Answers
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Why should we NOT use sys.setdefaultencoding(“utf-8”) in a py script?
...ch as UTF-8, which the Python runtime will use whenever it has to decode a string buffer to unicode.
This function is only available at Python start-up time, when Python scans the environment. It has to be called in a system-wide module, sitecustomize.py, After this module has been evaluated, the...
How to read and write excel file
... and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?
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How can I perform a `git pull` without re-entering my SSH password?
...use the key!
Neither do I! Thankfully, there’s a nifty little tool called
ssh-agent that can save your passphrase securely so you don’t have
to re-enter it. If you’re on OSX Leopard or later your keys can be
saved in the system’s keychain to make your life even easier. Most
linu...