remove brackets from string python code example

Example 1: how to remove text in brackets of python

>>> import re 
>>> x = "This is a sentence. (once a day) [twice a day]"
>>> re.sub("[\(\[].*?[\)\]]", "", x)
'This is a sentence.  '

Example 2: how do i remove the brackets around a list in python

l = ['a', 2, 'c']
print str(l)[1:-1]
'a', 2, 'c'