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callable() function in Python returns
True if the object passed appears to be callable. Otherwise, it returns
The syntax of the
callable() method is
callable() method can take only one argument, i.e., an object.
callable() Return Value
callable() function returns
True– if the object appears callable
False– if the object is not callable.
Note: There may be few cases where
callable() returns True, but the call to the object may fail. But in case if
callable() returns False, the calling object will never succeed.
Example 1: How does callable() works?
Here, the object
number is not callable. And, the object
getData appears to be callable (but may not be callable).
# returns false as the object of integer is not callable number = 10 print(callable(number)) def getData(): print("Hello World") # returns true as the variable is callable obj = getData print(callable(obj))
Example 2: When an Object is callable
callable() method checks if the argument passed is either of the below two cases:
- An instance of a class having a
- It is of a type that indicates callability, such as in functions, methods, etc. or has a non-null
tp_call(c struct) member.
# Python program to demonstrate callable() class Test: def __call__(self): print('Hello World !!!') # Suggests that Test class is callable and returns True print(callable(Test)) # This proves that class is callable TestObject = Test() TestObject()
True Hello World !!!
Example 3: When an Object is NOT callable
callable() method returns True, suggesting that the Test class is callable, but the instance of Test is not callable, and it returns a TypeError: ‘Test’ object is not callable
# Python program to demonstrate NOT callable() class Test: def printdata(self): print('Hello World !!!') # Suggests that Test class is callable and returns True print(callable(Test)) # The object will be created but returns error while calling TestObject = Test() TestObject()
True Traceback (most recent call last): File "c:\Projects\Tryouts\main.py", line 11, in <module> TestObject() TypeError: 'Test' object is not callable