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How to check if there exists a process with a given pid in Python?
...o nothing otherwise.
import os
def check_pid(pid):
""" Check For the existence of a unix pid. """
try:
os.kill(pid, 0)
except OSError:
return False
else:
return True
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Show current key setting?
...
To see the current value currently defined for <leader>, use:
:let mapleader
Producing output like:
mapleader ,
It may be undefined if not previously set, defaulting instead to a backslash \
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How to make a select with array contains value clause in psql
...LECT * FROM table WHERE arr && '{s}'::text[];
Compare two arrays for containment.
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Why does integer overflow on x86 with GCC cause an infinite loop?
...ves you well-defined (twos-complement) overflow semantics, but can hurt performance.
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Javadoc: package.html or package-info.java
...so mentioned here and here.
Addendum: See also What’s package-info.java for?.
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Multiple file upload in php
...d get the path and store it in the database... Any good example you looked for doing multiple file upload...
14 Answers
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How to compile a 32-bit binary on a 64-bit linux machine with gcc/cmake
...does it belong? Te header files? The makefile? Nope, totally not an answer for me as a beginner.
– Tomáš Zato - Reinstate Monica
Sep 29 '15 at 10:09
1
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How to best display in Terminal a MySQL SELECT returning too many fields?
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Terminate the query with \G in place of ;. For example:
SELECT * FROM sometable\G
This query displays the rows vertically, like this:
*************************** 1. row ***************************
Host: localhost
Db: mydatabase1...
Question mark and colon in JavaScript
...called the Conditional Operator (which is a ternary operator).
It has the form of: condition ? value-if-true : value-if-false
Think of the ? as "then" and : as "else".
Your code is equivalent to
if (max != 0)
hsb.s = 255 * delta / max;
else
hsb.s = 0;
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IntelliJ IDEA hint parameters of method
...
Use CTRL+P (CMD+P for Mac), it should show something similar.
You may also find the reference card (PDF) handy.
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