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How to remove the first Item from a list?
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Python List
list.pop(index)
>>> l = ['a', 'b', 'c', 'd']
>>> l.pop(0)
'a'
>>> l
['b', 'c', 'd']
>>>
del list[index]
>>> l = ['a', 'b', 'c', 'd']
>>> del l[0]
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Converting a column within pandas dataframe from int to string
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0.7.0, come with python 2.7 on Ubuntu system
– Malfet
Jul 31 '13 at 13:11
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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
...with arbitrary order (http://theory.stanford.edu/~sergei/papers/soda10-mrc.pdf) and one ought to assume operators are commutative in addition to being associative to give deterministic results. The latter is defined in terms of catomorphisms and requires that the collections have a notion of sequenc...
How to convert floats to human-readable fractions?
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From Python 2.6 on there is the fractions module.
(Quoting from the docs.)
>>> from fractions import Fraction
>>> Fraction('3.1415926535897932').limit_denominator(1000)
Fraction(355, 113)
>>> from mat...
Delete the first three rows of a dataframe in pandas
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@DanielMorgan That is not the case as python ranges are half open. As to why that is, is another question. See stackoverflow.com/questions/4504662/… or quora.com/…
– drexiya
May 9 '16 at 7:10
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What is Turing Complete?
...compensate what JS doesn't have. (asm.js should be mentioned here) . Java ,Python or C++ are true 'Turing Complete ' examples. But js? I don't think so.
– Michael IV
Dec 19 '17 at 22:30
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List to array conversion to use ravel() function
I have a list in python and I want to convert it to an array to be able to use ravel() function.
6 Answers
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Jinja2 template variable if None Object set a default value
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I am amazed this simplicity! Python's x or y is if x is false, then y, else x. See: 5.2. Boolean Operations — and, or, not
– kenjiuno
Nov 22 '17 at 2:28
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How do I specify a single test in a file with nosetests?
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Wow that's terrible, classic python libraries, not a care for existing interfaces
– Dagrooms
Feb 20 '18 at 16:04
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What are five things you hate about your favorite language? [closed]
...+" is a good operator for concatenation in a strongly typed language (like Python). In a weakly typed language (like Javascript or C) it is terrible; it decides (silently!) that 'sum: '+2+3 is not 'sum: 5' but 'sum: 23'. Someone with more Javascript experience can give better examples.
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