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<pre><code>class Fraction:
"""Class for performing fraction arithmetic.
Each Fraction has two attributes: a numerator, n and a deconominator, d.
Both must be integer and the deonominator cannot be zero."""
def __init__(self,n,d):
"""Performs error checking and standardises to ensure denominator is
positive"""
if type(n)!=int or type(d)!=int:
raise TypeError("n and d must be integers")
if d==0:
raise ValueError("d must be positive")
elif d<0:
self.n = -n
self.d = -d
else:
self.n = n
self.d = d
def __str__(self):
"""Gives string representation of Fraction (so we can use print)"""
return(str(self.n) + "/" + str(self.d))
def __add__(self, otherFrac):
"""Produces new Fraction for the sum of two Fractions"""
newN = self.n*otherFrac.d + self.d*otherFrac.n
newD = self.d*otherFrac.d
newFrac = Fraction(newN, newD)
return(newFrac)
def __sub__(self, otherFrac):
"""Produces new Fraction for the difference between two Fractions"""
newN = self.n*otherFrac.d - self.d*otherFrac.n
newD = self.d*otherFrac.d
newFrac = Fraction(newN, newD)
return(newFrac)
def __mul__(self, otherFrac):
"""Produces new Fraction for the product of two Fractions"""
newN = self.n*otherFrac.n
newD = self.d*otherFrac.d
newFrac = Fraction(newN, newD)
return(newFrac)
def __truediv__(self, otherFrac):
"""Produces new Fraction for the quotient of two Fractions"""
newN = self.n*otherFrac.d
newD = self.d*otherFrac.n
newFrac = Fraction(newN, newD)
return(newFrac)
</code></pre>
<p>如上面显示的代码,如何打印</p>
<pre><code>Fraction(1,3) == Fraction(2,6)
</code></pre>
<p>例如:</p>
<pre><code>Fraction(1,2) + Fraction(1,3)
Fraction(1,2) - Fraction(1,3)
Fraction(1,2) * Fraction(1,3)
Fraction(1,2) / Fraction(1,3)
</code></pre>
<p>他们每次都在计算。当我试图打印分数(1,3)=分数(2,6)时,结果是<code>False</code>。如何让它计算为<code>True</code>?你知道吗</p>
<p>我怎样才能不使用<code>import fraction</code>。你知道吗</p>