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improve add and mul fraction (special cases)

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lafrite 2014-06-27 10:31:10 +02:00
parent 0ca7a9d0fb
commit 369c2cd77a
1 changed files with 70 additions and 19 deletions
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89
pymath/fraction.py
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@ -72,6 +72,9 @@ class Fraction(object):
return number return number
def __add__(self, other): def __add__(self, other):
if other == 0:
return [self]
number = self.convert2fraction(other) number = self.convert2fraction(other)
steps = [] steps = []
@ -103,12 +106,17 @@ class Fraction(object):
return steps return steps
def __radd__(self, other): def __radd__(self, other):
if other == 0:
return [self]
number = self.convert2fraction(other) number = self.convert2fraction(other)
return number + self return number + self
def __sub__(self, other): def __sub__(self, other):
if other == 0:
return [self]
number = self.convert2fraction(other) number = self.convert2fraction(other)
steps = [] steps = []
@ -140,6 +148,9 @@ class Fraction(object):
return steps return steps
def __rsub__(self, other): def __rsub__(self, other):
if other == 0:
return [self]
number = self.convert2fraction(other) number = self.convert2fraction(other)
return number - self return number - self
@ -148,31 +159,50 @@ class Fraction(object):
return Fraction(-self._num,self._denom).simplify() return Fraction(-self._num,self._denom).simplify()
def __mul__(self, other): def __mul__(self, other):
number = self.convert2fraction(other)
steps = [] steps = []
gcd1 = gcd(self._num, number._denom) if other == 0:
if gcd1 != 1: return [0]
num1 = [int(self._num/ gcd1), gcd1, "*"] elif other == 1:
denom2 = [int(number._denom/ gcd1), gcd1, "*"] return [self]
elif type(other) == int:
gcd1 = gcd(other, self._denom)
if gcd1 != 1:
num = [self._num, int(other/gcd1), "*", gcd1,"*"]
denom = [int(self._denom/gcd1), gcd1, "*"]
else:
num = [self._num, other, "*"]
denom = [self._denom]
steps.append(num + denom + ["/"])
num = int(self._num * other / gcd1)
denom = int(self._denom / gcd1)
else: else:
num1 = [self._num] number = self.convert2fraction(other)
denom2 = [number._denom]
gcd2 = gcd(self._denom, number._num) gcd1 = gcd(self._num, number._denom)
if gcd2 != 1: if gcd1 != 1:
num2 = [int(number._num/ gcd2), gcd2, "*"] num1 = [int(self._num/ gcd1), gcd1, "*"]
denom1 = [int(self._denom/ gcd2), gcd2, "*"] denom2 = [int(number._denom/ gcd1), gcd1, "*"]
else: else:
num2 = [number._num] num1 = [self._num]
denom1 = [self._denom] denom2 = [number._denom]
gcd2 = gcd(self._denom, number._num)
if gcd2 != 1:
num2 = [int(number._num/ gcd2), gcd2, "*"]
denom1 = [int(self._denom/ gcd2), gcd2, "*"]
else:
num2 = [number._num]
denom1 = [self._denom]
steps.append(num1 + num2 + [ '*'] + denom1 + denom2 + ['*', '/']) steps.append(num1 + num2 + [ '*'] + denom1 + denom2 + ['*', '/'])
num = int(self._num * number._num / (gcd1 * gcd2)) num = int(self._num * number._num / (gcd1 * gcd2))
denom = int(self._denom * number._denom / (gcd1 * gcd2)) denom = int(self._denom * number._denom / (gcd1 * gcd2))
ans_frac = Fraction(num, denom) ans_frac = Fraction(num, denom)
steps.append(ans_frac) steps.append(ans_frac)
@ -186,6 +216,11 @@ class Fraction(object):
return number * self return number * self
def __truediv__(self, other): def __truediv__(self, other):
if other == 0:
raise ZeroDivisionError("division by zero")
elif other == 1:
return [self]
number = self.convert2fraction(other) number = self.convert2fraction(other)
steps = [] steps = []
@ -272,6 +307,22 @@ if __name__ == '__main__':
print(str(h) , "/", str(t)) print(str(h) , "/", str(t))
for i in (h / t): for i in (h / t):
print(i) print(i)
print("---------")
print(str(h) , "+", str(0))
for i in (h + 0):
print(i)
print("---------")
print(str(h) , "*", str(1))
for i in (h * 1):
print(i)
print("---------")
print(str(h) , "*", str(0))
for i in (h * 0):
print(i)
print("---------")
print(str(h) , "*", str(4))
for i in (h * 4):
print(i)
#print(f.simplify()) #print(f.simplify())