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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, ''):...
How to get current CPU and RAM usage in Python?
...m status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms.
15 Answers
...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
... self.val = val
def __repr__(self):
return 'Foo({!r})'.format(self.val)
foo = Foo(1)
a = ['foo', foo]
b = a.copy()
c = a[:]
d = list(a)
e = copy.copy(a)
f = copy.deepcopy(a)
# edit orignal list and instance
a.append('baz')
foo.val = 5
print('original: %r\nlist.copy(): %r\nsl...
Get class that defined method
...
import inspect
def get_class_that_defined_method(meth):
for cls in inspect.getmro(meth.im_class):
if meth.__name__ in cls.__dict__:
return cls
return None
share
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...
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...
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
...
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...
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...
Python __str__ and lists
...l automatically call the toString() method on each object inside the List. For example, if my list contains objects o1, o2, and o3, list.toString() would look something like this:
...
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():
...