remove brackets from string python

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

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

1premrtrtryt