Guess the output:

Question

Guess the output:
x=[[0],[1]]
print((''.join(list(map(str,x)))))
A. ('[0][1]')
B. ('01')
C. 01
D. [0][1]

Answer 1

You can not only guess the output but also check it in the code playground by running the code.
Output will be D
[0][1]

map(str,x) converts each item of the list x (which is [[0],[1]]) to a string.
list() creates list from that elements.
result of executing list(map(str,x)) is a new list with two string elements:
['[0]', '[1]']
''.join(['[0]', '[1]']) creates a new string by joining all elements of the list using empty string as separator, so output will be
[0][1]