Convert list of tuples to list?

Question

How do I convert

[(1,), (2,), (3,)]

to

[1, 2, 3]

Answer 1

Using operator or sum

>>> from functools import reduce ### If python 3
>>> import operator
>>> a = [(1,), (2,), (3,)]
>>> list(reduce(operator.concat, a))
[1, 2, 3]

(OR)

>>> list(sum(a,()))
[1, 2, 3]
>>> 

If in python > 3 please do the import of reduce from functools like from functools import reduce

https://docs.python.org/3/library/functools.html#functools.reduce