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How to filter a dictionary according to an arbitrary condition function?
... comprehension:
{k: v for k, v in points.iteritems() if v[0] < 5 and v[1] < 5}
And in Python 3:
{k: v for k, v in points.items() if v[0] < 5 and v[1] < 5}
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Insert, on duplicate update in PostgreSQL?
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16 Answers
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Set markers for individual points on a line in Matplotlib
...For example, using a dashed line and blue circle markers:
plt.plot(range(10), linestyle='--', marker='o', color='b')
A shortcut call for the same thing:
plt.plot(range(10), '--bo')
Here is a list of the possible line and marker styles:
================ ===============================
c...
Circle-Rectangle collision detection (intersection)
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193
There are only two cases when the circle intersects with the rectangle:
Either the circle's ...
Find number of months between two Dates in Ruby on Rails
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12 Answers
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Deleting lines from one file which are in another file
I have a file f1 :
9 Answers
9
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Most efficient way to reverse a numpy array
... something like this:
arr = np.array(some_sequence)
reversed_arr = arr[::-1]
do_something(arr)
look_at(reversed_arr)
do_something_else(arr)
look_at(reversed_arr)
I'm not a numpy expert, but this seems like it would be the fastest way to do things in numpy. If this is what you are already doing,...
Histogram using gnuplot?
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binwidth=5
bin(x,width)=width*floor(x/width)
plot 'datafile' using (bin($1,binwidth)):(1.0) smooth freq with boxes
check out help smooth freq to see why the above makes a histogram
to deal with ranges just set the xrange variable.
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How to JSON serialize sets?
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121
JSON notation has only a handful of native datatypes (objects, arrays, strings, numbers, boole...
Understanding “randomness”
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Just a clarification
Although the previous answers are right whenever you try to spot the ra...