In [1]:

    

import itertools


    

In [2]:

    

l_2d = [[0, 1], [2, 3]]


    

In [3]:

    

print(list(itertools.chain.from_iterable(l_2d)))


    

    




[0, 1, 2, 3]

In [4]:

    

t_2d = ((0, 1), (2, 3))


    

In [5]:

    

print(tuple(itertools.chain.from_iterable(t_2d)))


    

    




(0, 1, 2, 3)

In [6]:

    

l_3d = [[[0, 1], [2, 3]], [[4, 5], [6, 7]]]


    

In [7]:

    

print(list(itertools.chain.from_iterable(l_3d)))


    

    




[[0, 1], [2, 3], [4, 5], [6, 7]]

In [8]:

    

l_mix = [[0, 1], [2, 3], 4]


    

In [9]:

    

# print(list(itertools.chain.from_iterable(l_mix)))
# TypeError: 'int' object is not iterable


    

In [10]:

    

print(sum(l_2d, []))


    

    




[0, 1, 2, 3]

In [11]:

    

# print(sum(l_2d))
# TypeError: unsupported operand type(s) for +: 'int' and 'list'


    

In [12]:

    

print(sum(t_2d, ()))


    

    




(0, 1, 2, 3)

In [13]:

    

print(sum(l_3d, []))


    

    




[[0, 1], [2, 3], [4, 5], [6, 7]]

In [14]:

    

# print(sum(l_mix, []))
# TypeError: can only concatenate list (not "int") to list


    

In [15]:

    

import collections


    

In [16]:

    

def flatten(l):
    for el in l:
        if isinstance(el, collections.abc.Iterable) and not isinstance(el, (str, bytes)):
            yield from flatten(el)
        else:
            yield el


    

In [17]:

    

print(list(flatten(l_2d)))


    

    




[0, 1, 2, 3]

In [18]:

    

print(list(flatten(l_3d)))


    

    




[0, 1, 2, 3, 4, 5, 6, 7]

In [19]:

    

print(list(flatten(l_mix)))


    

    




[0, 1, 2, 3, 4]

In [20]:

    

l_t_r_mix = [[0, 1], (2, 3), 4, range(5, 8)]


    

In [21]:

    

print(list(flatten(l_t_r_mix)))


    

    




[0, 1, 2, 3, 4, 5, 6, 7]

In [22]:

    

def flatten_list(l):
    for el in l:
        if isinstance(el, list):
            yield from flatten_list(el)
        else:
            yield el


    

In [23]:

    

print(list(flatten_list(l_2d)))


    

    




[0, 1, 2, 3]

In [24]:

    

print(list(flatten_list(l_3d)))


    

    




[0, 1, 2, 3, 4, 5, 6, 7]

In [25]:

    

print(list(flatten_list(l_mix)))


    

    




[0, 1, 2, 3, 4]

In [26]:

    

print(list(flatten_list(l_t_r_mix)))


    

    




[0, 1, (2, 3), 4, range(5, 8)]

In [27]:

    

def flatten_list_tuple_range(l):
    for el in l:
        if isinstance(el, (list, tuple, range)):
            yield from flatten_list_tuple_range(el)
        else:
            yield el


    

In [28]:

    

print(list(flatten_list_tuple_range(l_t_r_mix)))


    

    




[0, 1, 2, 3, 4, 5, 6, 7]