matching question

[snippsat]

Using list comprehensions or sets are common ways to solve this.

>>> participants = ('bob','bill','casey')
>>> paid = ('bob', 'bill')
>>> [x for x in participants if x in paid]
['bob', 'bill']
>>> len([x for x in participants if x in paid])
2

>>> list(set(participants).intersection(set(paid)))
['bob', 'bill']
>>> set(participants) & set(paid)
{'bob', 'bill'}
>>>