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Regular expression for floating point numbers
...g a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123.456
.456
See a working example
If you also want to match 123. (a period with no decimal part), then you'll need a slightly longer expression:
[+-]?([0-9]+([.][0-9]*)?|[.][0-9]+)
See pkeller's answer for a fuller...
How can I pass a list as a command-line argument with argparse?
...'<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
nargs='+' takes 1 or more arguments, nargs='*' takes zero or more.
append
parser.add_argument('-l','--list', action='append', help='<Required> Set flag', required=True)
# Use like:
# python arg.p...
Alphabet range in Python
... 'y', 'z']
And to do it with range
>>> list(map(chr, range(97, 123))) #or list(map(chr, range(ord('a'), ord('z')+1)))
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
Other helpful string module features:...
Is there a way of having git show lines added, lines changed and lines removed?
...ified lines. For example:
git diff HEAD c9af3e6136e8aec1f79368c2a6164e56bf7a7e07 | diffstat -C -m
The -C option is for getting colourised output; the -m option is for showing the number of modified lines.
Sample output:
app/controllers/application_controller.rb | 30 -------------------!!!
1 ...
array_push() with key value pair
...
Warning: $a['123'] = 456; - string '123' is converted to integer key 123.
– bancer
Jul 2 at 12:58
1
...
jQuery UI Sortable Position
...rting has stopped. event Type: Event
Piece of code:
http://jsfiddle.net/7a1836ce/
<script type="text/javascript">
var sortable = new Object();
sortable.s1 = new Array(1, 2, 3, 4, 5);
sortable.s2 = new Array(1, 2, 3, 4, 5);
sortable.s3 = new Array(1, 2, 3, 4, 5);
sortable.s4...
How to unset a JavaScript variable?
...hen the target isn't an object property. e.g.,
(function() {
var foo = 123;
delete foo; // wont do anything, foo is still 123
var bar = { foo: 123 };
delete bar.foo; // foo is gone
}());
But since global variables are actually members of the window object, it works.
When prototype c...
Do Git tags only apply to the current branch?
... over the contents of a commit; e.g.: 6f6b5997506d48fc6267b0b60c3f0261b6afe7a2)
Branches come into play only indirectly:
At the time of creating a tag, by implying the commit that the tag will point to:
Not specifying a target for a tag defaults to the current branch's most recent commit ...
Extracting the last n characters from a ruby string
...e a one liner, you can put a number greater than the size of the string:
"123".split(//).last(5).to_s
For ruby 1.9+
"123".split(//).last(5).join("").to_s
For ruby 2.0+, join returns a string
"123".split(//).last(5).join
...
使用 XML 和 Web 服务 · App Inventor 2 中文网
...evel tag-delimited structure in the input string. For example, decoding
123
returns the list of one pair (hello, 123) and decoding
123
456
returns the list of two pairs (hello, 123) and (goodbye, 456).
For each pair, the first element is the tag, and the second element is the decoding of t...