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How is set() implemented?
I've seen people say that set objects in python have O(1) membership-checking. How are they implemented internally to allow this? What sort of data structure does it use? What other implications does that implementation have?
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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: 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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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...
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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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...
'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...
TypeError: 'module' object is not callable
...gt;>> import socket
>>> socket
<module 'socket' from 'C:\Python27\lib\socket.pyc'>
>>> socket.socket
<class 'socket._socketobject'>
>>>
>>> from socket import socket
>>> socket
<class 'socket._socketobject'>
This is what the erro...
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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