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Cost of exception handlers in Python
...)
Result:
a = 1
try:
b = 10/a
except ZeroDivisionError:
pass
0.25 usec/pass
a = 1
if a:
b = 10/a
0.29 usec/pass
a = 1
b = 10/a
0.22 usec/pass
a = 0
try:
b = 10/a
except ZeroDivisionError:
pass
0.57 usec/pass
a = 0
if a:
b = 10/a
0.04 usec/pass
a = 0
b = 10/a
ZeroDivis...
How is “int* ptr = int()” value initialization not illegal?
...
5 Answers
5
Active
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How do I reverse a C++ vector?
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258
There's a function std::reverse in the algorithm header for this purpose.
#include <vector&...
Run Cron job every N minutes plus offset
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529
To run a task every 20 minutes starting at 5 past the hour, try this:
5-59/20 * * * *
Expl...
Python assigning multiple variables to same value? list behavior
... are naming the same object, use the is operator:
>>> a=b=c=[0,3,5]
>>> a is b
True
You then ask:
what is different from this?
d=e=f=3
e=4
print('f:',f)
print('e:',e)
Here, you're rebinding the name e to the value 4. That doesn't affect the names d and f in any way.
I...
What does ** (double star/asterisk) and * (star/asterisk) do for parameters?
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Georgy
4,77555 gold badges3838 silver badges4646 bronze badges
answered Aug 31 '08 at 15:17
Peter HoffmannPeter ...
CentOS+Nginx+PHP+MySQL详细配置(图解) - 更多技术 - 清泛网 - 专注C/C++及内核技术
...贴出来，就不做过多的讲解了
#useradd mysql
#tar zxvf mysql-5.0.40.tar.gz
#cd mysql-5.0.40
#./configure --prefix=/usr/local/mysql
#make && make install
#/usr/local/mysql/bin/mysql_install_db --user=mysql //初始化MySQL数据库
#chown -R mysql /usr/local/mysql/var
#/usr...
What is the >>>= operator in C?
...a[ !!0X.1P1 ] )
The literal 0xFULL is the same as 0xF (which is hex for 15); the ULL just specifies that it's an unsigned long long literal. In any case, as a boolean it's true, so 0xFULL ? '\0' : -1 evaluates to '\0', which is a character literal whose numerical value is simply 0.
Meanwhile, 0X...
Matplotlib transparent line plots
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edited May 15 '15 at 14:39
ASGM
8,6282424 silver badges4545 bronze badges
answered Mar 14 ...