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Access multiple elements of list knowing their index
...ay I would like to create a new list, which contains element with index 1, 2, 5, from given list [-2, 1, 5, 3, 8, 5, 6]. What I did is:
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Find intersection of two nested lists?
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20 Answers
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Returning the product of a list
...tor import mul
reduce(mul, list, 1)
it is better and faster. With python 2.7.5
from operator import mul
import numpy as np
import numexpr as ne
# from functools import reduce # python3 compatibility
a = range(1, 101)
%timeit reduce(lambda x, y: x * y, a) # (1)
%timeit reduce(mul, a) ...
Python JSON serialize a Decimal object
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edited Sep 1 at 14:12
Dewald Abrie
1,12355 silver badges1919 bronze badges
answered Dec 25 '09 at ...
How to convert a string of numbers to an array of numbers?
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My 2 cents for golfers:
b="1,2,3,4".split`,`.map(x=>+x)
backquote is string litteral so we can omit the parenthesis (because of the nature of split function) but it is equivalent to split(','). The string is now an array, ...
What's the difference between KeyDown and KeyPress in .NET?
... not directly result in calls to KeyPress:
Shift, Ctrl, Alt
F1 through F12
Arrow keys
Examples of keys that do result in calls to KeyPress:
A through Z, 0 through 9, etc.
Spacebar
Tab (KeyChar='\t', ASCII 9)
Enter (KeyChar='\r', ASCII 13)
Esc (KeyChar='\x1b', ASCII 27)
Backspace (KeyChar='\b',...
Shell command to sum integers, one per line?
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通信连接组件 · App Inventor 2 中文网
...开浏览器到指定的网页。 假设您要访问的页面是“www.fun123.cn”（您可以随意替换自己的选择），将属性设置为：
Action: android.intent.action.VIEW
DataUri: http://www.fun123.cn
调用第三方地图也可以使用这个启动器：
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HTML5 Number Input - Always show 2 decimal places
...s there's any way to format an input[type='number'] value to always show 2 decimal places?
15 Answers
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