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How to efficiently build a tree from a flat structure?
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Python solution
def subtree(node, relationships):
return {
v: subtree(v, relationships)
for v in [x[0] for x in relationships if x[1] == node]
}
For example:
# (child, parent) pairs where -1 means...
Adding a user to a group in django
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Not the answer you're looking for? Browse other questions tagged python django or ask your own question.
Algorithm to find Largest prime factor of a number
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Here's the best algorithm I know of (in Python)
def prime_factors(n):
"""Returns all the prime factors of a positive integer"""
factors = []
d = 2
while n > 1:
while n % d == 0:
factors.append(d)
n /= d
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How do I create a URL shortener?
... do the redirect.
Example implementations (provided by commenters)
C++
Python
Ruby
Haskell
C#
CoffeeScript
Perl
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How to style a JSON block in Github Wiki?
... in different Language syntax formats.But all time favorites are Perl, js, python, & elixir.
This is how it looks.
The following screenshots are from the Gitlab in a markdown file.
This may vary based on the colors using for syntax in MARKDOWN files.
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Functional programming vs Object Oriented programming [closed]
...ood model for the problem domain. For example, see list comprehensions in Python or std.range in the D programming language. These are inspired by functional programming.
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How to load a tsv file into a Pandas DataFrame?
I'm new to python and pandas. I'm trying to get a tsv file loaded into a pandas DataFrame .
6 Answers
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Argmax of numpy array returning non-flat indices
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How to update a plot in matplotlib?
...#unnecessary, but useful
Note that both of these only seem to work with ipython --pylab=tk, a.k.a.backend = TkAgg
Thank you for the help with everything.
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django-debug-toolbar not showing up
...th find . -name "*.pyc" -exec rm {} \; from the project root. Finally, run python manage.py shell and execute from django.conf import settings and check the value of settings.INSTALLED_APPs.
– Chris Pratt
May 9 '12 at 14:42
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