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What is the difference between an expression and a statement in Python?
In Python, what is the difference between expressions and statements?
14 Answers
14
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Why are Python lambdas useful? [closed]
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Are you talking about lambda functions? Like
lambda x: x**2 + 2*x - 5
Those things are actually quite useful. Python supports a style of programming called functional programming where you can pass functions to other functions to do stuff. Example:
mult3 = filter(lambda x:...
Finding local maxima/minima with Numpy in a 1D numpy array
Can you suggest a module function from numpy/scipy that can find local maxima/minima in a 1D numpy array? Obviously the simplest approach ever is to have a look at the nearest neighbours, but I would like to have an accepted solution that is part of the numpy distro.
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How to break out from a ruby block?
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Use the keyword next. If you do not want to continue to the next item, use break.
When next is used within a block, it causes the block to exit immediately, returning control to the iterator method, which may then begin a new iteration by inv...
How to get the first column of a pandas DataFrame as a Series?
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>>> import pandas as pd
>>> df = pd.DataFrame({'x' : [1, 2, 3, 4], 'y' : [4, 5, 6, 7]})
>>> df
x y
0 1 4
1 2 5
2 3 6
3 4 7
>>> s = df.ix[:,0]
>>> type(s)
<class 'pandas.core.series.Series'>
>>>
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Draw on HTML5 Canvas using a mouse
I want to draw on a HTML Canvas using a mouse (for example, draw a signature, draw a name, ...)
13 Answers
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Application auto build versioning
...nk) has an option to set the value of an uninitialised string variable:
-X importpath.name=value
Set the value of the string variable in importpath named name to
value.
Note that before Go 1.5 this option took two separate arguments.
Now it takes one argument split on the firs...
Rolling median algorithm in C
...lues, then perform a binary search to insert the new value and remove the existing one at each iteration.
12 Answers
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C# LINQ find duplicates in List
...lement in the group. In LINQ, this translates to:
var query = lst.GroupBy(x => x)
.Where(g => g.Count() > 1)
.Select(y => y.Key)
.ToList();
If you want to know how many times the elements are repeated, you can use:
var query = lst.GroupBy(x =...
What's the correct way to sort Python `import x` and `from x import y` statements?
...stack.org/developer/hacking/
http://developer.plone.org/reference_manuals/external/plone.api/contribute/conventions.html#grouping-and-sorting
PS: the isort utility automatically sorts your imports.
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