Invalid syntax using dict comprehension

Question

Given a list of floats named 'x', I would like to create a dict mapping each x in x[1:-1] to it's neighbors using a dict comprehension. I have tried the following line :

neighbours = {x1:(x0,x2) for (x0,x1,x2) in zip(x[:-2],x[1:-1],x[2:])}

However, the syntax seems to be invalid. What am I doing wrong?

This works for me on sample list: `[1.0,2.3,4.1,1.9,7.0,9.9]`. You need Python 2.7+ or 3.0+ to use dict/set comprehensions. — jamylak, Jun 07 '12 at 14:14
My exact python version is "python 2.6.6 {r266:84297, Aug 24 2010, 18:46:32} [MSC v.1500 32 bit (Intel)] on win32" — Chris, Jun 07 '12 at 14:18

score 23 · Accepted Answer · edited Dec 29 '15 at 09:18

23

Dict comprehensions are only available in Python 2.7 upwards. For earlier versions, you need the dict() constructor with a generator:

dict((x1, (x0,x2)) for (x0,x1,x2) in zip(x[:-2],x[1:-1],x[2:]))

edited Dec 29 '15 at 09:18

Will

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answered Jun 07 '12 at 14:17

Daniel Roseman

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Invalid syntax using dict comprehension

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