Can please someone explain how one may use 'is' in an 'if' condition. I am working with the fractions module, and I'm having some trouble: <pre class="prettyprint"><code>>>> Fraction(0, 1) is 0 False >>> float(Fraction(0, 1)) 0.0 >>> float(Fraction(0,1)) is 0.0 False </code></pre> The only thing I found to work is: <pre class="prettyprint"><code>>>> F = Fraction(a,b) >>> if F >= 0: ... if F(0, 1) <= 0: ... ... </code></pre> Is there a way to use 'is' here? Thanks.

<code>a is b</code> is equivalent to <code>id(a) == id(b)</code>

How does "is" work in python?

Can please someone explain how one may use 'is' in an 'if' condition. I am working with the fractions module, and I'm having some trouble:

>>> Fraction(0, 1) is 0
False
>>> float(Fraction(0, 1))
0.0
>>> float(Fraction(0,1)) is 0.0
False

The only thing I found to work is:

>>> F = Fraction(a,b)
>>> if F >= 0:
...     if F(0, 1) <= 0:
...                      ...

Is there a way to use 'is' here? Thanks.

a is b is equivalent to id(a) == id(b)