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Python 2.7: Print to File
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If you want to use the print function in Python 2, you have to import from __future__:
from __future__ import print_function
But you can have the same effect without using the function, too:
print >>f1, 'This is a t...
How to list all installed packages and their versions in Python?
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If you have pip install and you want to see what packages have been installed with your installer tools you can simply call this:
pip freeze
It will also include version numbers for the installed packages.
Update
pip has...
Django TemplateDoesNotExist?
...2.5/site-packages/projectname/templates/template3.html
Second solution:
If that still doesn't work and assuming that you have the apps configured in settings.py like this:
INSTALLED_APPS = (
'appname1',
'appname2',
'appname3',
)
By default Django will load the templates under templ...
Python exit commands - why so many and when should each be used?
It seems that python supports many different commands to stop script execution. The choices I've found are: quit() , exit() , sys.exit() , os._exit()
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error LNK2019: 无法解析的外部符号 __imp__PlaySoundW@12，该符号在函数 \...
error LNK2019: 无法解析的外部符号 __imp__PlaySoundW@12，该符号在函数 "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z) 中被引用#include <mmsystem.h>#pragma comment(lib, "WINMM.LIB")
#include <mmsystem.h>
#pragma comm...
What happens to global and static variables in a shared library when it is dynamically linked?
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This is a pretty famous difference between Windows and Unix-like systems.
No matter what:
Each process has its own address space, meaning that there is never any memory being shared between processes (unless you use some inter-process communicatio...
Comparing two branches in Git? [duplicate]
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git diff branch_1..branch_2
That will produce the diff between the tips of the two branches. If you'd prefer to find the diff from their common ancestor to test, you can use three dots instead of two:
git diff branch_1...branch...
常用Sql - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
常用Sqlmysql：drop table if exists tablename;不能写成drop table tablename if exists tablename;mysql：建立索引SqlCREATE TABLE t...mysql：drop table if exists tablename;
不能写成
drop table tablename if exists tablename;
mysql：建立索引Sql
CREATE TABLE tablename (
`ID...
Completion block for popViewController
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I put this in an extension of UINavigationController in Swift: extension UINavigationController { func popViewControllerWithHandler(handler: ()->()) { CATransaction.begin() CATransaction.setCompletionBlock(handler) self.popViewControllerAnimated(true) ...
Static nested class in Java, why?
... @DavidS Thanks for the link! Yeah, I was wrong, reading my comment now I see that my rephrase was incorrect. As you said: An inner class interacts with the instance members through an implicit reference to its enclosing class, and this points out another interesting property of non-static in...