Function Name:
callable()
Function Signature:
callable(object)
Function Overview:
The function callable() determines whether a Python object is a callable object or not. It returns True if the object is callable and False if the object is not callable.
The following language constructs are callable in Python:
- A function
- A class; Calling a class creates a new instance of the class.
- An object; an object is callable in python.
Example 1:
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def Function1(): pass
class Mouse: def move(self): print("Moving")
def __call__(self,p): print("calling a mouse object")
listObject = [1,2,3,4,5]
# Check a list is callable print("Is a list callable:{}".format(callable(listObject)))
# Check an immutable sequence of bytes is callable bytesObject = bytes("Sample Text", "utf-8") print("Is a bytes instance callable:{}".format(callable(bytesObject)))
# Check a function is callable print("Is a function callable:{}".format(callable(Function1)))
# Check a class is callable print("Is a class callable:{}".format(callable(Mouse)))
# Check an object implementing __call__() is callable mouse1 = Mouse() print("Is an object implementing the __call__() callable:{}".format(callable(mouse1))) |
Output:
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Is a list callable:False Is a bytes instance callable:False Is a function callable:True Is a class callable:True Is an object implementing the __call__() callable:True |
Example 2:
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class Date: @staticmethod def initdate(): print("initing")
def move(self): print("moving")
# Is the move() instance method callable dateInstance = Date() print("Is an instance method callable:{}".format(callable(dateInstance.move)))
# Is a class method callable print("Is a class method callable:{}".format(callable(dateInstance.initdate))) |
Output:
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Is an instance method callable:True Is a class method callable:True |