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How to implement __iter__(self) for a container object (Python)
... next(rev) # note no need to call iter()
'm'
>>> nums = Reverse(range(1,10))
>>> next(nums)
9
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Apply pandas function to column to create multiple new columns?
...I usually do this using zip:
>>> df = pd.DataFrame([[i] for i in range(10)], columns=['num'])
>>> df
num
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
>>> def powers(x):
>>> return x, x**2, x**3, x**4, x**5, x**6
>>> df[...
Why does “return list.sort()” return None, not the list?
... sorted list.
It's more convenient.
l1 = []
n = int(input())
for i in range(n):
user = int(input())
l1.append(user)
sorted(l1,reverse=True)
list.sort() method modifies the list in-place and returns None.
if you still want to use sort you can do this.
l1 = []
n = int(input())
for i...
Python idiom to return first item or None
...ce you don't have to construct the whole list like in next(iter(x for x in range(10) if x % 2 == 0), None)
– RubenLaguna
Feb 11 '16 at 9:25
...
Performance optimization strategies of last resort [closed]
...or repeated calls that contain calculations that have a relatively limited range of inputs, consider making a lookup (array or dictionary) that contains the result of that calculation for all values in the valid range of inputs. Then use a simple lookup inside the algorithm instead.
Down-sides: if f...
What is the correct way to restore a deleted file from SVN?
...ght click in Explorer, go to TortoiseSVN -> Merge...
Make sure "Merge a range of revisions" is selected, click Next
In the "Revision range to merge" textbox, specify the revision that removed the file
Check the "Reverse merge" checkbox, click Next
Click Merge
That is completely untested, howeve...
How do I change the language of moment.js?
...ions for global default format
with timezone
*require:
require('moment-range');
require('moment-timezone');
*import:
import 'moment-range';
import 'moment-timezone';
use zones:
const newYork = moment.tz("2014-06-01 12:00", "America/New_York");
const losAngeles = newYork.clone().tz("Amer...
Remove non-utf8 characters from string
...as UTF-8 characters. But if the errors are random, this could leave some strange symbols.
$regex = <<<'END'
/
(
(?: [\x00-\x7F] # single-byte sequences 0xxxxxxx
| [\xC0-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| [\xE0-\xEF][\x80-\xBF...
Greenlet Vs. Threads
...raries expect concurrency to be achieved through threads, so you may get strange behaviour if you provide that via greenlets.
– Matt Joiner
Mar 24 '13 at 11:11
...
Piping buffer to external command in Vim
...current buffer to the stdin of an external command. From :help :w_c:
:[range]w[rite] [++opt] !{cmd}
Execute {cmd} with [range] lines as standard input (note the space in front of the '!'). {cmd} is executed like with ":!{cmd}", any '!' is replaced with the previous command |:!|.
A relate...