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#!/usr/bin/python3
# Example of class usage in python.
# Let's define a new class to represent fraction numbers
class fraction(object):
def __init__(self, numer, denom):
self.numer = numer
self.denom = denom
def __str__(self):
return str(self.numer) + ' / ' + str(self.denom)
# Getters definition
# We almost never want to directly manipulate the data inside objects,
# so, we should (almost) always define getters and setters methods for data
# manipulation inside a class
def getNumer(self):
return self.numer
def getDenom(self):
return self.denom
def __add__(self, other):
new_numer = (self.getNumer() * other.getDenom()) + \
(other.getNumer() * self.getDenom())
new_denom = (self.getDenom() * other.getDenom())
return fraction(new_numer, new_denom)
def __sub__(self, other):
new_numer = (self.getNumer() * other.getDenom()) - \
(other.getNumer() * self.getDenom())
new_denom = (self.getDenom() * other.getDenom())
return fraction(new_numer, new_denom)
# Return the float representation of the fraction
def convert(self):
return self.getNumer() / self.getDenom()
# Set example
# Create a class to represent a set of numbers which are not allowed to be
# repeated
class Set(object):
def __init__(self):
self.set = []
def insert(self, nval):
if nval not in self.set:
self.set.append(nval)
else:
raise ValueError(str(nval) + " is already in the set")
def remove(self,nval):
try:
self.set.remove(nval)
except:
raise ValueError(str(nval) + " not found!")
def member(self, nval):
return nval in self.set
def __str__(self):
self.set.sort()
result = ''
for i in self.set:
result += str(i) + ', '
return '{' + result[:-2] + '}'
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