callable(object, /)
判斷object是否可呼叫，若可呼叫則回傳True
函數與類別可呼叫，若類別實作__call__函數，其實例也可以呼叫
EX: 比較函數與基本類型是否可呼叫
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def f(): return 5 print(callable(f)) # True x = 5 print(callable(x)) # False，int不可呼叫 y = "123" print(callable(y)) # False，str不可呼叫 |
EX: 類別與其實例是否可呼叫
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class A: def __init__(self): pass a = A() print(callable(A)) # True print(callable(a)) # False，未實現__call__，實例不可呼叫 class B: def __call__(self): print('This is B') b = B() print(callable(b)) # True |