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Reverse colormap in matplotlib
... Regarding reversing LinearSegmentedColormaps, I just did this for some colourmaps. Here's an IPython Notebook about it.
– kwinkunks
Apr 26 '14 at 12:57
...
Lazy Method for Reading Big File in Python?
... break
yield data
with open('really_big_file.dat') as f:
for piece in read_in_chunks(f):
process_data(piece)
Another option would be to use iter and a helper function:
f = open('really_big_file.dat')
def read1k():
return f.read(1024)
for piece in iter(read1k, ''):...
What is the canonical way to check for errors using the CUDA runtime API?
...is often suggested that the return status of every API call should checked for errors. The API documentation contains functions like cudaGetLastError , cudaPeekAtLastError , and cudaGetErrorString , but what is the best way to put these together to reliably catch and report errors without requiri...
How to perform OR condition in django queryset?
...
Is it better to use this type of query or perform two separate queries?
– MHB
Mar 16 at 15:06
...
Class method differences in Python: bound, unbound and static
...type (the class of a class, cf. this question) to not create bound methods for method_two.
Now, you can invoke static method both on an instance or on the class directly:
>>> a_test = Test()
>>> a_test.method_one()
Called method_one
>>> a_test.method_two()
Called method_...
Why is require_once so bad to use?
... thousands of *_once, you could do the work yourself in a lighter fashion. For simple apps, just making sure you've only included it once should suffice but if you're still getting redefine errors, you could something like this:
if (!defined('MyIncludeName')) {
require('MyIncludeName');
def...
PHP “php://input” vs $_POST
... $_POST, only is supposed to wrap data that is either
application/x-www-form-urlencoded (standard content type for simple form-posts) or
multipart/form-data (mostly used for file uploads)
This is because these are the only content types that must be supported by user agents. So the server and P...
Flatten nested dictionaries, compressing keys
...me way you would flatten a nested list, you just have to do the extra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
import collections
def flatten(d, parent_key='', sep='_'):
items = []
for k, v in d.items():
...
How to use filter, map, and reduce in Python 3
...e so it doesn’t need a list at all. Particularly tricky is map() invoked for the side effects of the function; the correct transformation is to use a regular for loop (since creating a list would just be wasteful).
[...]
Builtins
[...]
Removed reduce(). Use functools.reduce() if you really nee...
Python Linked List
...practical value in Python.
I've never used a singly linked list in Python for any problem except educational.
Thomas Watnedal suggested a good educational resource How to Think Like a Computer Scientist, Chapter 17: Linked lists:
A linked list is either:
the empty list, represented by None, o...