Question

Is the a short syntax for joining a list of lists into a single list( or iterator) in python?

For example I have a list as follows and I want to iterate over a,b and c.

x = [['a','b'], ['c']] 

The best I can come up with is as follows.

result = [] [ result.extend(el) for el in x]   for el in result:   print el 

Answer 1

import itertools a = [['a','b'], ['c']] print(list(itertools.chain.from_iterable(a))) 

This gives

['a', 'b', 'c']