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What is the use of “assert” in Python?
...rt True # nothing happens
>>> assert False
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AssertionError
Assertions can include an optional message, and you can disable them when running the interpreter.
To print a message if the assertion fails:
as...
How do I design a class in Python?
...internal state. For this Database object you could hide how the networking calls work, or batch queries or updates, or provide a caching layer.
The problem is this Database object is HUGE. It represents how to access a database, so under the covers it could do anything and everything. Clearly netw...
What is the meaning of the term arena in relation to memory?
...llocation works. The only thing outside your control is the single library call for the initial allocation.
One popular use case is where each arena is only used to allocate memory blocks of one single, fixed size. In that case, you can write very efficient reclamation algorithms. Another use case ...
Visual Studio debugging “quick watch” tool and lambda expressions
...g. It requires the EE to actually generate the full function body for the call back (all the way to IL). The EE does nothing of this sort today, instead it's an interpreter.
– JaredPar
Jan 16 '14 at 18:29
...
pass post data with window.location.href
...on attribute of the form to the URL and the method attribute to POST, then call the submit method on the form tag.
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“Single-page” JS websites and SEO
...ernet enabled platforms) both have a similar underlying philosophy: semantically rich markup that is "accessible" (i.e. can be accessed, viewed, read, processed, or otherwise used) to all these different browsers. A screen reader, a search engine crawler or a user with JavaScript enabled, should all...
What is the recommended way to delete a large number of items from DynamoDB?
...
What I ideally want to do is call LogTable.DeleteItem(user_id) -
Without supplying the range, and have it delete everything for me.
An understandable request indeed; I can imagine advanced operations like these might get added over time by the AWS te...
Is it possible to use “/” in a filename?
...ou can't, unless your filesystem has a bug. Here's why:
There is a system call for renaming your file defined in fs/namei.c called renameat:
SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname)
When the system call gets i...
Python Requests and persistent sessions
... = s.get('https://localhost/profile_data.json', ...)
#cookies sent automatically!
#do whatever, s will keep your cookies intact :)
For more about sessions: https://requests.kennethreitz.org/en/master/user/advanced/#session-objects
...
How can I mask a UIImageView?
...d with two parameters: image and maskImage, these you have to set when you call the method. An example call could look like this, assuming the method is in the same class and the pictures are in your bundle:
Note - amazingly the images do not even have to be the same size.
...
UIImage *image = [UI...