aRegius

>>> import random
>>> z = [x for x in range(10)]
>>> z
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> random.shuffle(z)
>>> z
[6, 4, 8, 3, 9, 5, 7, 1, 2, 0]
>>> for im in z:
...    print im
...
6
4
8
3
9
5
7
1
2
0

clean_list = []
with open('input.txt', 'r', encoding="utf-8") as f_input:
    for l in f_input:
        if not l.startswith('http'):
            clean_list.append(l)

with open('input.txt', 'w', encoding="utf-8") as f_out:
    f_out.write('\n'.join(clean_list))

tuu = {'chat': []}
....
tuu[chat].append(a)

array1 = [1, 2, 3]
array2 = []
array3 = [1, 3]
if not all((array1, array2, array3)):
    print("есть пустой!")

myArray1 = [1, 2, 3]
myArray2 = [2, 3]
myArray3 = [1, 3]
print([l for l in (myArray1, myArray2, myArray3) if l])
# или
print([','.join(map(str, l)) for l in (myArray1, myArray2, myArray3) if l] or 'pustoi')

words = ['слово1','слово2','слово3']
string = 'слово123'
{i:True for i in words if i in string}

0b1  # Читать
0b10  # Писать
0b100  # Редактировать
0b1000  # Удалять

0b1010  # юзер может писать и удалять, но не может читать и редактировать