lst = ['a', 'z', 1, 2, 'python', [5, 6, 7]]
print(lst[0])
print(lst[2])
print(lst[4])
print(lst[5])
print(lst[5][0])
lst[4] = 'python 3.6.0'
print(lst[4])
print(lst)
'''
run:
a
1
python
[5, 6, 7]
5
python 3.6.0
['a', 'z', 1, 2, 'python 3.6.0', [5, 6, 7]]
'''