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How to implement a queue using two stacks?
...
Keep 2 stacks, let's call them inbox and outbox.
Enqueue:
Push the new element onto inbox
Dequeue:
If outbox is empty, refill it by popping each element from inbox and pushing it onto outbox
Pop and return the top element from outbox
Using this method, each element will be in each stac...
“Invalid JSON primitive” in Ajax processing
...ore likely to get more upvotes — and help the questioner learn something new.
– lmo
Sep 7 '16 at 22:19
I want to pas...
Equivalent of strace -feopen < command > on mac os X
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f1925978%2fequivalent-of-strace-feopen-command-on-mac-os-x%23new-answer', 'question_page');
}
);
...
How do I use Maven through a proxy?
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For details of setting up a proxy for Maven, see the mini guide.
Essentially you need to ensure the proxies section in either the global settings ([maven install]/conf/settings.xml), or user settings (${user.home}/.m2/settings.xml) is configured correctly. It is better to do this in ...
When saving, how can you check if a field has changed?
...t(pk=instance.pk)
except sender.DoesNotExist:
pass # Object is new, so field hasn't technically changed, but you may want to do something else here.
else:
if not obj.some_field == instance.some_field: # Field has changed
# do something
...
Logging levels - Logback - rule-of-thumb to assign log levels
...h to read.
Debug means that something normal and insignificant happened; a new user came to the site, a page was rendered, an order was taken, a price was updated. This is the stuff excluded from info because there would be too much of it.
Trace is something i have never actually used.
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psycopg2: insert multiple rows with one query
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New execute_values method in Psycopg 2.7:
data = [(1,'x'), (2,'y')]
insert_query = 'insert into t (a, b) values %s'
psycopg2.extras.execute_values (
cursor, insert_query, data, template=None, page_size=100
)
The python...
Django Admin - change header 'Django administration' text
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@DavidArcos You need to register your models at new admin_site that you created. Like admin_site.register(MyModel, ModelAdmin)
– Andrey Fedoseev
Aug 1 '14 at 13:06
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Compare if two variables reference the same object in python
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While the two correct solutions x is z and id(x) == id(z) have already been posted, I want to point out an implementation detail of python. Python stores integers as objects, as an optimization it generates a bunch of small integers at its start (-5 to 256) and points...
Tips for debugging .htaccess rewrite rules
...ging for users on shared hosting
1. Use a Fake-user agent
When testing a new rule, add a condition to only execute it with a fake user-agent that you will use for your requests. This way it will not affect anyone else on your site.
e.g
#protect with a fake user agent
RewriteCond %{HTTP_USER_AG...