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Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...另外，条件表达式中的与或非为分是：and, or, not关键字。for 循环
sum = 0
for i = 1, 100 do
sum = sum + i
end复制代码
从1到100的奇数和
sum = 0
for i = 1, 100, 2 do
sum = sum + i
end复制代码
从100到1的偶数和
sum = 0
for i = 100, 1...
iPhone get SSID without private library
... of the network it is connected to: If it is connected to a Adhoc network for a 3rd party hardware device it needs to be functioning in a different manner than if it is connected to the internet.
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How do I check OS with a preprocessor directive?
...hings based on the operating system on which it gets compiled. I'm looking for something like this:
16 Answers
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Django filter queryset __in for *every* item in list
...ion is, as suggested by jpic and sgallen in the comments, to add .filter() for each category. Each additional filter adds more joins, which should not be a problem for small set of categories.
There is the aggregation approach. This query would be shorter and perhaps quicker for a large set of cate...
Python nested functions variable scoping [duplicate]
...I get this error:
UnboundLocalError: local variable '_total' referenced before assignment
This problem is caused by this line:
_total += PRICE_RANGES[key][0]
The documentation about Scopes and Namespaces says this:
A special quirk of Python is that – if no global statement is in effect ...
Python: Is it bad form to raise exceptions within __init__?
Is it considered bad form to raise exceptions within __init__ ? If so, then what is the accepted method of throwing an error when certain class variables are initialized as None or of an incorrect type?
...
Why does running the Flask dev server run itself twice?
I'm using Flask for developing a website and while in development I run flask using the following file:
6 Answers
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How can you encode a string to Base64 in JavaScript?
...
Note that this also works for webkit browsers, such as Safari.
– Daniel Von Fange
Sep 2 '10 at 9:59
5
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Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
...rue == 1 , in Python (assuming that they are not reassigned by the user)? For instance, is it in any way guaranteed that the following code will always produce the same results, whatever the version of Python (both existing and, likely, future ones)?
...
What exactly does += do in python?
...
In Python, += is sugar coating for the __iadd__ special method, or __add__ or __radd__ if __iadd__ isn't present. The __iadd__ method of a class can do anything it wants. The list object implements it and uses it to iterate over an iterable object append...