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...外，条件表达式中的与或非为分是：and, or, not关键字。
for 循环
从1加到100
1
2
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4
sum = 0
for i = 1, 100 do
sum = sum + i
end
从1到100的奇数和
1
2
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4
sum = 0
for ...
Is errno thread-safe?
...s defined by including the
header , as specified by the
C Standard ... For each thread of a
process, the value of errno shall not
be affected by function calls or
assignments to errno by other threads.
Also see http://linux.die.net/man/3/errno
errno is thread-local; setting it in one...
How can I get the client's IP address in ASP.NET MVC?
... MAY use the de facto standard of placing the client's IP address in the X-Forwarded-For HTTP header. Aside from there is no guarantee that a request has a X-Forwarded-For header, there is also no guarantee that the X-Forwarded-For hasn't been SPOOFED.
Original Answer
Request.UserHostAddress
T...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...g as the prediction is correct most of the time, this will tend to be good for performance.
Like all such performance optimisations you should only do it after extensive profiling to ensure the code really is in a bottleneck, and probably given the micro nature, that it is being run in a tight loop...
What is a mixin, and why are they useful?
...s "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin?
16 Answers
...
How to deal with SettingWithCopyWarning in Pandas?
...ticularly when the first selection returns a copy. [see GH5390 and GH5597 for background discussion.]
df[df['A'] > 2]['B'] = new_val # new_val not set in df
The warning offers a suggestion to rewrite as follows:
df.loc[df['A'] > 2, 'B'] = new_val
However, this doesn't fit your usage, w...
How to include PHP files that require an absolute path?
...
just a question, why realpath() for $_SERVER["DOCUMENT_ROOT"]? This shall not output always the canonical path?
– João Pimentel Ferreira
Nov 15 '15 at 0:30
...
How can I reference a commit in an issue comment on GitHub?
...
Note that this only works for commits of the repo or its forks you are writing the issue for. I have a case where my fork suddenly was unforked and I noticed this commit trick not working anymore.
– mxmlnkn
Mar 2...
What is the __del__ method, How to call it?
... However, I cannot find a place where this method is used. The main reason for that is that I do not know how this method is used, probably not like that: obj1.del() . So, my questions is how to call the __del__ method?
...
Pass variables to Ruby script via command line
... parse lists of parameters into a single option and can generate your help for you.
Also, if any of your information being passed in is pretty static, that doesn't change between runs, put it into a YAML file that gets parsed. That way you can have things that change every time on the command-line,...