who can tell me what can call the built-in functions in next code 
<p>i know some of this,ex.</p>

<p><code>__mod__</code> will be call  /</p>

<p><code>__eq__</code>will be call == > and &lt;</p>

<p>but i don't know all.</p>

<pre><code>    def __nonzero__(self):
        # an image is "true" if it contains at least one non-zero pixel
        return self.im.getbbox() is not None
    def __abs__(self):
        return self.apply("abs", self)
    def __pos__(self):
        return self
    def __neg__(self):
        return self.apply("neg", self)

    # binary operators
    def __add__(self, other):
        return self.apply("add", self, other)
    def __radd__(self, other):
        return self.apply("add", other, self)
    def __sub__(self, other):
        return self.apply("sub", self, other)
    def __rsub__(self, other):
        return self.apply("sub", other, self)
    def __mul__(self, other):
        return self.apply("mul", self, other)
    def __rmul__(self, other):
        return self.apply("mul", other, self)
    def __div__(self, other):
        return self.apply("div", self, other)
    def __rdiv__(self, other):
        return self.apply("div", other, self)
    def __mod__(self, other):
        return self.apply("mod", self, other)
    def __rmod__(self, other):
        return self.apply("mod", other, self)
    def __pow__(self, other):
        return self.apply("pow", self, other)
    def __rpow__(self, other):
        return self.apply("pow", other, self)

    # bitwise
    def __invert__(self):
        return self.apply("invert", self)
    def __and__(self, other):
        return self.apply("and", self, other)
    def __rand__(self, other):
        return self.apply("and", other, self)
    def __or__(self, other):
        return self.apply("or", self, other)
    def __ror__(self, other):
        return self.apply("or", other, self)
    def __xor__(self, other):
        return self.apply("xor", self, other)
    def __rxor__(self, other):
        return self.apply("xor", other, self)
    def __lshift__(self, other):
        return self.apply("lshift", self, other)
    def __rshift__(self, other):
        return self.apply("rshift", self, other)

    # logical
    def __eq__(self, other):
        return self.apply("eq", self, other)
    def __ne__(self, other):
        return self.apply("ne", self, other)
    def __lt__(self, other):
        return self.apply("lt", self, other)
    def __le__(self, other):
        return self.apply("le", self, other)
    def __gt__(self, other):
        return self.apply("gt", self, other)
    def __ge__(self, other):
        return self.apply("ge", self, other)
</code></pre>
