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Why use apparently meaningless do-while and if-else statements in macros?
...ave a more complicated body of code that needs to go in its own block, say for example to declare local variables. In the most general case the solution is to use something like do ... while to cause the macro to be a single statement that takes a semicolon without confusion.
#define BAR(X) do { \...
Python Dictionary Comprehension
Is it possible to create a dictionary comprehension in Python (for the keys)?
8 Answers
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How do I expire a PHP session after 30 minutes?
I need to keep a session alive for 30 minutes and then destroy it.
15 Answers
15
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Ora-00257 错误处理一列 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...列sqlplus assysdba报错ORA-12162切回系统确认系统当前的ORACLE_HOME和ORACLE_SID环境变量[oracle@asdlabdb01~]$echo$ORACLE_HOME空的[oracle...sqlplus /as sysdba
报错ORA-12162
切回系统
确认系统当前的ORACLE_HOME和ORACLE_SID环境变量
[oracle@asdlabdb01 ~]$ echo $ORA...
Why use def main()? [duplicate]
...ng this if, we can make Python behave like them, which feels more familiar for many people.
Code will be cleaner, easier to read, and better organized. (yeah, I know this is subjective)
It will be possible to import that python code as a module without nasty side-effects.
This means it will be po...
How do you know when to use fold-left and when to use fold-right?
...eaning trees and fold-right produces right-leaning trees, but when I reach for a fold, I sometimes find myself getting bogged down in headache-inducing thought trying to determine which kind of fold is appropriate. I usually end up unwinding the entire problem and stepping through the implementatio...
Bin size in Matplotlib (Histogram)
... + binwidth, binwidth))
Added to original answer
The above line works for data filled with integers only. As macrocosme points out, for floats you can use:
import numpy as np
plt.hist(data, bins=np.arange(min(data), max(data) + binwidth, binwidth))
...
Multi-line regex support in Vim
I notice the standard regex syntax for matching across multiple lines is to use /s, like so:
1 Answer
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Resumable downloads when using PHP to send the file?
We are using a PHP scripting for tunnelling file downloads, since we don't want to expose the absolute path of downloadable file:
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Checking for empty queryset in Django
What is the recommended idiom for checking whether a query returned any results?
Example:
7 Answers
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