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Does pandas iterrows have performance issues?
...pply
a) reductions that can be performed in cython
b) iteration in python space
4) itertuples
5) iterrows
6) updating an empty frame (e.g. using loc one-row-at-a-time)
Using a custom Cython routine is usually too complicated, so let's skip that for now.
1) Vectorization is ALWAYS, ALWAYS ...
How can I open the interactive matplotlib window in IPython notebook?
I am using IPython with --pylab=inline and would sometimes like to quickly switch to the interactive, zoomable matplotlib GUI for viewing plots (the one that pops up when you plot something in a terminal Python console). How could I do that? Preferably without leaving or restarting my notebook.
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How to handle exceptions in a list comprehensions?
I have some a list comprehension in Python in which each iteration can throw an exception.
6 Answers
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Change the name of a key in dictionary
I want to change the key of an entry in a Python dictionary.
15 Answers
15
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What's a correct and good way to implement __hash__()?
...getting and combining hashes to C builtins, which is typically faster than Python level code.
– ShadowRanger
Nov 4 '19 at 23:18
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Faster s3 bucket duplication
... answered May 10 '14 at 5:55
python1981python1981
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Creating Threads in python
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Python 3 has the facility of Launching parallel tasks. This makes our work easier.
It has for thread pooling and Process pooling.
The following gives an insight:
ThreadPoolExecutor Example
import concurrent.futures
impo...
Can a variable number of arguments be passed to a function?
...nyArgs(1, 2, 3)
I was called with 3 arguments: (1, 2, 3)
As you can see, Python will unpack the arguments as a single tuple with all the arguments.
For keyword arguments you need to accept those as a separate actual argument, as shown in Skurmedel's answer.
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Analyze audio using Fast Fourier Transform
I am trying to create a graphical spectrum analyzer in python.
4 Answers
4
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Read password from stdin
Scenario: An interactive CLI Python program, that is in need for a password. That means also, there's no GUI solution possible.
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