1 files changed, 80 insertions, 0 deletions
diff --git a/mit/oop/fractions.py b/mit/oop/fractions.py
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+++ b/mit/oop/fractions.py
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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] + '}'