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How to generate all permutations of a list?
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Starting with Python 2.6 (and if you're on Python 3) you have a standard-library tool for this: itertools.permutations.
import itertools
list(itertools.permutations([1, 2, 3]))
If you're using an older Python (<2.6) for some reason or are just...
pandas GroupBy columns with NaN (missing) values
...the same placeholder hack).
However, as described in another answer, from pandas 1.1 you have better control over this behavior, NA values are now allowed in the grouper using dropna=False
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How to get the return value from a thread in python?
...m) for param in param_list] The order will be maintained, and exiting the with will allow result collection. [f.result() for f in futures]
– jayreed1
Jun 4 at 21:29
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Confused about __str__ on list in Python [duplicate]
Coming from a Java background, I understand that __str__ is something like a Python version of toString (while I do realize that Python is the older language).
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ERROR: Error 1005: Can't create table (errno: 121)
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I searched quickly for you, and it brought me here. I quote:
You will get this message if you're trying to add a constraint with a
name that's already used somewhere else
To check constraints use the following SQL query:
SELECT
constraint_n...
Reusing output from last command in Bash
Is the output of a Bash command stored in any register? E.g. something similar to $? capturing the output instead of the exit status.
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How can I tell Rails to use RSpec instead of test-unit when creating a new Rails app?
I have test-unit installed and rspec installed (along with -core , -expectations , -mocks and -rails version 2.6.x). When I run the command rails new foo , it uses test-unit to generate the test stub files instead of rspec .
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How to prevent auto-closing of console after the execution of batch file
What command can I put at the end of a batch file to prevent auto-closing of the console after the execution of the file?
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Swift days between two NSDates
I'm wondering if there is some new and awesome possibility to get the amount of days between two NSDates in Swift / the "new" Cocoa?
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What is the most “pythonic” way to iterate over a list in chunks?
...rks for any iterable (not just sequences as the above code); it is concise and probably just as fast or even faster. Though it might be a bit obscure (unclear) for people unfamiliar with itertools module.
– jfs
Jan 12 '09 at 14:39
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