issubclass函数与isinstance 函数比较接近，isinstance 函数是判断一个实例对象与类的关系，issubclass函数判断类与类的关系。
并且isinstance 函数可以接受任何类型实例，但issubclass函数不行，会输出TypeError异常。
# File: builtin-issubclass-example-1.py
class A:
pass
class B:
pass
class C(A):
pass
class D(A, B):
pass
def dump(object):
print(object, "=>",)
if issubclass(object, A):
print("A",)
if issubclass(object, B):
print("B",)
if issubclass(object, C):
print("C",)
if issubclass(object, D):
print("D",)
print()
dump(A)
dump(B)
dump(C)
dump(D)
dump(0)
dump("string")
结果输出如下：
= RESTART: D:/work/csdn/python_Game1/example/builtin-issubclass-example-1.py =<class '__main__.A'> =>A<class '__main__.B'> =>B<class '__main__.C'> =>AC<class '__main__.D'> =>ABD0 =>Traceback (most recent call last): File "D:/work/csdn/python_Game1/example/builtin-issubclass-example-1.py", line 31, in <module> dump(0) File "D:/work/csdn/python_Game1/example/builtin-issubclass-example-1.py", line 17, in dump if issubclass(object, A):TypeError: issubclass() arg 1 must be a class>>>
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