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Why does ~True result in -2?
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240
int(True) is 1.
1 is:
00000001
and ~1 is:
11111110
Which is -2 in Two's complement1
1 ...
How to install mongoDB on windows?
...ng to test out mongoDB and see if it is anything for me. I downloaded the 32bit windows version, but have no idea on how to continue from now on.
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7个App Inventor 2文件操作实用技巧，读写文件从未如此顺手 - App应用开发 ...
7个App Inventor 2文件操作实用技巧，读写文件从未如此顺手
开发App时，数据存在哪儿是个绕不开的问题——用户的笔记、游戏存档、从网络下载的配置文件，几乎每个应用都要和文件打交道。App Inventor 2 自带的文件管理器（File...
How can I convert a dictionary into a list of tuples?
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>>> d = { 'a': 1, 'b': 2, 'c': 3 }
>>> d.items()
[('a', 1), ('c', 3), ('b', 2)]
>>> [(v, k) for k, v in d.iteritems()]
[(1, 'a'), (3, 'c'), (2, 'b')]
It's not in the order you want, but dicts don't have any specific order anyway...
Select count(*) from multiple tables
...an I select count(*) from two different tables (call them tab1 and tab2 ) having as result:
18 Answers
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New Array from Index Range Swift
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This works for me:
var test = [1, 2, 3]
var n = 2
var test2 = test[0..<n]
Your issue could be with how you're declaring your array to begin with.
EDIT:
To fix your function, you have to cast your Slice to an array:
func aFunction(numbers: Array<Int...
python tuple to dict
For the tuple, t = ((1, 'a'),(2, 'b'))
dict(t) returns {1: 'a', 2: 'b'}
6 Answers
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Append a dictionary to a dictionary [duplicate]
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525
You can do
orig.update(extra)
or, if you don't want orig to be modified, make a copy first:
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Is there a difference between x++ and ++x in java?
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293
++x is called preincrement while x++ is called postincrement.
int x = 5, y = 5;
System.out....