is positive int

is_positive_int

#!/usr/bin/python
def is_positive_int(thing):
    try:
        assert(unicode(thing).isdigit())
    except Exception:
        return False
    else:
        return True
        
def _test_is_positive_int():
    try:
        for val in 12, '12':
            assert(is_positive_int(val) is True)

        for val in '5.0', '-5.0', '-5', -5, True, False, lambda: None, NotImplemented:
            assert(is_positive_int(val) is False)
    except AssertionError:
        print 'test failed'
        import sys
        exc_class, exc, tb = sys.exc_info()
        raise exc_class, exc, tb
    else:
        print 'test succeeded'