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Are list-comprehensions and functional functions faster than “for loops”?
In terms of performance in Python, is a list-comprehension, or functions like map() , filter() and reduce() faster than a for loop? Why, technically, they run in a C speed , while the for loop runs in the python virtual machine speed ?.
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Python function global variables?
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Within a Python scope, any assignment to a variable not already declared within that scope creates a new local variable unless that variable is declared earlier in the function as referring to a globally scoped variable with the keywo...
Extract a part of the filepath (a directory) in Python
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In Python 3.4 you can use the pathlib module:
>>> from pathlib import Path
>>> p = Path('C:\Program Files\Internet Explorer\iexplore.exe')
>>> p.name
'iexplore.exe'
>>> p.suffix
'.exe'
>&g...
Share Large, Read-Only Numpy Array Between Multiprocessing Processes
...know about this one.
No. Refer to example below.
Example
#!/usr/bin/env python
from multiprocessing import Process
import sharedmem
import numpy
def do_work(data, start):
data[start] = 0;
def split_work(num):
n = 20
width = n/num
shared = sharedmem.empty(n)
shared[:] = nump...
Python: Ignore 'Incorrect padding' error when base64 decoding
...ding === always works. Any extra = chars are seemingly safely discarded by Python.
– Acumenus
Nov 24 '19 at 21:30
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are there dictionaries in javascript like python?
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Actually, Python allows statement-terminating semicolons, so the first example is completely valid both in Python and JavaScript
– celticminstrel
Oct 15 '15 at 22:45
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Python unittest - opposite of assertRaises?
...code you would raise a KeyError, that would be an error, not a failure. In python - differently than some other languages - Exceptions are routinely used for control flow, this is why we have the except <ExceptionName> syntax indeed. To that regard, user9876's solution is simply wrong.
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Inherit docstrings in Python class inheritance
I'm trying to do some class inheritance in Python. I'd like each class and inherited class to have good docstrings. So I think for the inherited class, I'd like it to:
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'str' object does not support item assignment in Python
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In Python, strings are immutable, so you can't change their characters in-place.
You can, however, do the following:
for i in str:
srr += i
The reasons this works is that it's a shortcut for:
for i in str:
srr = srr...
How to get file creation & modification date/times in Python?
...us/library/14h5k7ff.aspx) stores its creation date. You can access this in Python through os.path.getctime() or the .st_ctime attribute of the result of a call to os.stat(). This won't work on Unix, where the ctime is the last time that the file's attributes or content were changed.
On Mac, as well ...