Python中callable函数如何使用?
本文和大家分享的主要是python中使用callable函数相关内容,一起来看看吧,希望对大家学习python有所帮助。 可以通过下面的例子来学习一下什么样的对象是可以调用的: # File: builtin-callable-example-1.py def dump(function): if callable(function): print(function, "is callable") else: print(function, "is *not* callable") class A: def method(self, value): return value class B(A): def __call__(self, value): return value a = A() b = B() dump(0) # simple objects dump("string") dump(callable) dump(dump) # function dump(A) # classes dump(B) dump(B.method) dump(a) # instances dump(b) dump(b.method) 输出结果如下: == RESTART: D:/work/csdn/python_Game1/example/builtin-callable-example-1.py == 0 is *not* callable string is *not* callable is callable is callable is callable is callable is callable <__main__.a object="" at="" 0x0000021fde6f22b0="">is *not* callable <__main__.b object="" at="" 0x0000021fde6f24a8="">is callable <bound method A.method of <__main__.b object="" at="" 0x0000021fde6f24a8="">> is callable >>> 在这里值得注意是A和B对象都是可以调用的,但是A的实例对象不能调用,因为它没有实现__call__方法。 来源:大坡3D软件开发
页:
[1]