__init__.py 文件源码

def toString(value):
        """
        Convert a value to a string, if possible.
        """
        if isinstance(value, basestring):
            return value
        elif type(value) in [np.string_, np.str_]:
            return str(value)
        elif type(value) == np.unicode_:
            return unicode(value)
        else:
            raise TypeError("Could not convert %s to string type" % type(value))