Answer 1

x=[[0],[1]]
list(map(str,x))==>>
it convers....each item of x to a str(string) type...

so [0] gets...'[0]'
[1] gets...'[1]'

list(map(str,x))=[ '[0]', '[1]' ]
' '.join(list(map(str, x))) = ' [0][1]'

so now it has 7 length...
as '[0][1]' has 6 length
and while doing ' '.join..u r adding another space
so 7 length