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What does the tilde (~) mean in my composer.json file?
...uivalent to >= 2.0, < 3.0.
The full explanation is at Tilde Version Range docs page:
The ~ operator is best explained by example: ~1.2 is equivalent to >=1.2 <2.0.0, while ~1.2.3 is equivalent to >=1.2.3 <1.3.0.
Another way of looking at it is that using ~ specifies a min...
Finding the index of an item in a list
...port timeit
>>> timeit.timeit('l.index(999_999)', setup='l = list(range(0, 1_000_000))', number=1000)
9.356267921015387
>>> timeit.timeit('l.index(999_999, 999_990, 1_000_000)', setup='l = list(range(0, 1_000_000))', number=1000)
0.0004404920036904514
Only returns the index of t...
How to put multiple statements in one line?
...y with a sequence of simple statements, separated by semi-colon:
for i in range(10): print "foo"; print "bar"
But as soon as you add a construct that introduces an indented block (like if), you need the line break. Also,
for i in range(10): print "i equals 9" if i==9 else None
is legal and mig...
Generating a list of which files changed between hg versions
...", you might also consider using the "x::y" (DAG - Directed Acyclic Graph) range.
Given parallel changesets,
1--2---4
\---3
hg status --rev 1:4 would return (1,2,3,4),
i.e. anything between and including the endpoints, according to the local, numerical rev. This might (and most probably will)...
Change date format in a Java string
...
hh will give you the hour in the range 1-12, you'll need to use a in addition to print/parse AM or PM. To print/parse the hour in the range 0-23, use HH.
– Andre Holzner
Apr 7 '16 at 11:36
...
ipython notebook clear cell output in code
... the output of a cell.
from IPython.display import clear_output
for i in range(10):
clear_output(wait=True)
print("Hello World!")
At the end of this loop you will only see one Hello World!.
Without a code example it's not easy to give you working code. Probably buffering the latest n ev...
What's the difference between utf8_general_ci and utf8_unicode_ci?
...les for universal sorting and comparison, which sorts accurately in a wide range of languages.
utf8mb4_general_ci is a simplified set of sorting rules which aims to do as well as it can while taking many short-cuts designed to improve speed. It does not follow the Unicode rules and will result in ...
String replacement in Objective-C
...
It also posible string replacement with stringByReplacingCharactersInRange:withString:
for (int i = 0; i < card.length - 4; i++) {
if (![[card substringWithRange:NSMakeRange(i, 1)] isEqual:@" "]) {
NSRange range = NSMakeRange(i, 1);
card = [card stringByReplacingChara...
Bytes of a string in Java
...erences and a char[]. The Java language specification defines, that a char ranges from 0 to 65535, so two bytes are sufficient to keep a single char in memory. But a JVM does not have to store one char in 2 bytes, it only has to guarantee, that the implementation of char can hold values of the defin...
Why is January month 0 in Java Calendar?
...cture (defined in time.h) has an integer field tm_mon with the (commented) range of 0-11.
C based languages start arrays at index 0. So this was convenient for outputting a string in an array of month names, with tm_mon as the index.
...