N
if "blah" not in somestring:
continue
N
>>> str = "Messi is the best soccer player"
>>> "soccer" in str
True
>>> "football" in str
False
N
if word in mystring:
print('success')
N
if var in ('stringone', 'stringtwo'):
dosomething()
N
if var in ['string one', 'string two']:
do_something()