在python中识别数字

class Real(Complex):
    """To Complex, Real adds the operations that work on real numbers.
    In short, those are: conversion to float, trunc(), math.floor(),
    math.ceil(), round(), divmod(), //, %, <, <=, >, and >=.
    Real also provides defaults for some of the derived operations.
    """
    # XXX What to do about the __int__ implementation that's
    # currently present on float?  Get rid of it?
    @abstractmethod
    def __float__(self):
        """Any Real can be converted to a native float object."""
        raise NotImplementedError
    @abstractmethod
    def __trunc__(self):
        """Truncates self to an Integral.
        Returns an Integral i such that:
          * i>=0 iff self>0;
          * abs(i) <= abs(self);
          * for any Integral j satisfying the first two conditions,
            abs(i) >= abs(j) [i.e. i has "maximal" abs among those].
        i.e. "truncate towards 0".
        """
        raise NotImplementedError
    @abstractmethod
    def __floor__(self):
        """Finds the greatest Integral <= self."""
        raise NotImplementedError
    @abstractmethod
    def __ceil__(self):
        """Finds the least Integral >= self."""
        raise NotImplementedError
    @abstractmethod
    def __round__(self, ndigits:Integral=None):
        """Rounds self to ndigits decimal places, defaulting to 0.
        If ndigits is omitted or None, returns an Integral,
        otherwise returns a Real, preferably of the same type as
        self. Types may choose which direction to round half. For
        example, float rounds half toward even.
        """
        raise NotImplementedError
    def __divmod__(self, other):
        """The pair (self // other, self % other).
        Sometimes this can be computed faster than the pair of
        operations.
        """
        return (self // other, self % other)
    def __rdivmod__(self, other):
        """The pair (self // other, self % other).
        Sometimes this can be computed faster than the pair of
        operations.
        """
        return (other // self, other % self)
    @abstractmethod
    def __floordiv__(self, other):
        """The floor() of self/other. Integral."""
        raise NotImplementedError
    @abstractmethod
    def __rfloordiv__(self, other):
        """The floor() of other/self."""
        raise NotImplementedError
    @abstractmethod
    def __mod__(self, other):
        """self % other
        See
        https://mail.python.org/pipermail/python-3000/2006-May/001735.html
        and consider using "self/other - trunc(self/other)"
        instead if you're worried about round-off errors.
        """
        raise NotImplementedError
    @abstractmethod
    def __rmod__(self, other):
        """other % self"""
        raise NotImplementedError
    @abstractmethod
    def __lt__(self, other):
        """< on Reals defines a total ordering, except perhaps for NaN."""
        raise NotImplementedError
    @abstractmethod
    def __le__(self, other):
        raise NotImplementedError
    # __gt__ and __ge__ are automatically done by reversing the arguments.
    # (But __le__ is not computed as the opposite of __gt__!)
    # Concrete implementations of Complex abstract methods.
    # Subclasses may override these, but don't have to.
    def __complex__(self):
        return complex(float(self))
    @property
    def real(self):
        return +self
    @property
    def imag(self):
        return 0
    def conjugate(self):
        """Conjugate is a no-op for Reals."""
        return +self