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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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How can I convert JSON to CSV?
...son.loads(x)
f = csv.writer(open("test.csv", "wb+"))
# Write CSV Header, If you dont need that, remove this line
f.writerow(["pk", "model", "codename", "name", "content_type"])
for x in x:
f.writerow([x["pk"],
x["model"],
x["fields"]["codename"],
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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...
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...
What's the best way to do a backwards loop in C/C#/C++?
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Instead of doing
(sizeof a / sizeof *a)
Change your code so that it now does
(sizeof array_size(a))
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mysqli or PDO - what are the pros and cons? [closed]
... the prepared statements, the fact that it becomes a standard, etc. But I know that most of the time, convincing somebody works better with a killer feature. So there it is:
A really nice thing with PDO is you can fetch the data, injecting it automatically in an object. If you don't want to use an ...
Python element-wise tuple operations like sum
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It also blows up if a & b don't contain the same number of elements, or aren't "addable" (ex: map(operator.add, (1,2), ("3", "4"))
– Adam Parkin
Feb 13 '12 at 21:09
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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) ...
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...