Python callable() Function

In Python, callable() is a built-in function used to check whether a given object is callable. It returns True if the object is callable, and False otherwise.

Callable objects include functions, methods, classes, and certain class instances. An object is also considered callable if it defines the __call__() method.

Here are examples of using callable():

def foo():
    pass

class bar:
    def __init__(self):
        pass

    def __call__(self):
        return "hello"

b = bar()

print(callable(foo))  # True
print(callable(bar))  # True
print(callable(b))    # True
print(callable(1))    # False
print(callable('abc')) # False

In the above example, the function foo, class bar, and instance b are all callable, so callable() returns True. The integer 1 and string 'abc' are not callable, so callable() returns False.