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How do I correctly clean up a Python object?
...it close() statement is that you have to worry about people forgetting to call it at all or forgetting to place it in a finally block to prevent a resource leak when an exception occurs.
To use the with statement, create a class with the following methods:
def __enter__(self)
def __exit__(self...
How expensive is the lock statement?
I've been experimenting with multi threading and parallel processing and I needed a counter to do some basic counting and statistic analysis of the speed of the processing. To avoid problems with concurrent use of my class I've used a lock statement on a private variable in my class:
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Why do we always prefer using parameters in SQL statements?
...uld be
SELECT empSalary from employee where salary = 0 or 1=1
whereby all empSalaries would be returned.
Further, a user could perform far worse commands against your database, including deleting it If they wrote 0; Drop Table employee:
SELECT empSalary from employee where salary = 0; Drop Ta...
psql - save results of command to a file
I'm using psql's \dt to list all tables in a database and I need to save the results.
10 Answers
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Why can't an anonymous method be assigned to var?
...type of a lambda or anonymous method is Func of something. We'd still have all kinds of problems. What types would you like to be inferred for the following cases?
var x1 = (ref int y)=>123;
There is no Func<T> type that takes a ref anything.
var x2 = y=>123;
We don't know the type...
Select N random elements from a List in C#
... time you get to the end you will have your 5 items, and often you'll have all of them before that.
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Can jQuery read/write cookies to a browser?
...ve the final semicolon and some don't.... nice to have someone else handle all that.
– Peter Ajtai
Jun 12 '10 at 21:24
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Putting uncommitted changes at Master to a new branch by Git
...e1
git add deletedFile2
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git commit -m "My Custom Message"
I am not really sure about the deleted files, but I guess they aren't included when you use git add .
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“[notice] child pid XXXX exit signal Segmentation fault (11)” in apache error.log [closed]
... Hmm thats weird. Can you make sure that the process that segfaults actually is the on you are attached gdb to? check dmesg for the pid of the segfaulted process.
– Mattias Wadman
Aug 19 '12 at 19:54
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Convert character to ASCII code in JavaScript
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Fun fact: you don’t really need the 0 (first argument value) — just "\n".charCodeAt() will do.
– Mathias Bynens
Oct 17 '11 at 9:40
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