Python convert tuple to array [duplicate]

Question

How can I convert at 3-Dimensinal tuple into an array

a = []
a.append((1,2,4))
a.append((2,3,4))

in a array like:

b = [1,2,4,2,3,4]

Answer 1

Using list comprehension:

>>> a = [] >>> a.append((1,2,4)) >>> a.append((2,3,4)) >>> [x for xs in a for x in xs] [1, 2, 4, 2, 3, 4] 

Using itertools.chain.from_iterable:

>>> import itertools >>> list(itertools.chain.from_iterable(a)) [1, 2, 4, 2, 3, 4] 

Answer 2

The simple way, use extend method.

x = [] for item in a:     x.extend(item) 

Answer 3

If you mean array as in numpy array, you can also do:

a = []
a.append((1,2,4))
a.append((2,3,4))
a = np.array(a)
a.flatten()