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from Poll import Poll
class PollImplementation:
"""
A multiple choice poll, implements the Poll interface.
The poll has a question and a sequence of responses. Votes
are stored in a dictionary which maps response indexes to a
number of votes.
"""
__implements__=Poll
def __init__(self, question, responses):
self._question = question
self._responses = responses
self._votes = {}
for i in range(len(responses)):
self._votes[i] = 0
def castVote(self, index):
"Votes for a choice"
self._votes[index] = self._votes[index] + 1
def getTotalVotes(self):
"Returns total number of votes cast"
total = 0
for v in self._votes.values():
total = total + v
return total
def getVotesFor(self, index):
"Returns number of votes cast for a given response"
return self._votes[index]
def getResponses(self):
"Returns the sequence of responses"
return tuple(self._responses)
def getQuestion(self):
"Returns the question"
return self._question
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