meaning of parantheases

Answer 1

You can use it for math or any thing like logical comparisons etc.

Answer 2

different meanings of brackets in python

from:
http://stackoverflow.com/questions/30700603/ddg#30700731

[]: Used to define mutable data types - lists, list comprehensions and for indexing/lookup/slicing.
(): Define tuples, order of operations, generator expressions, function calls and other syntax.
{}: The two hash table types - dictionaries and sets.

Answer 3

parentheses is ()