In Python, we can give another name of the function. For the existing function, we can give another name, which is nothing but function aliasing.
Function aliasing in Python
In function aliasing, we create a new variable and assign the function reference to one existing function to the variable. We can verify that both the objects pointing to the same memory location using id() built-in function in Python.
Example 1: Basic usage of function aliasing in Python
Python3
def fun(name): print(f"Hello {name}, welcome to GeeksForGeeks!!!")cheer = funprint(f'The id of fun() : {id(fun)}')print(f'The id of cheer() : {id(cheer)}')fun('Geeks')cheer('Geeks') |
Output:
The id of fun() : 140716797521432 The id of cheer() : 140716797521432 Hello Geeks, welcome to GeeksForGeeks!!! Hello Geeks, welcome to GeeksForGeeks!!!
Explanation: In the above example, only one function is available, but we can call that function by using either fun or cheer name.
Example 2: Function aliasing of custom objects
Here, we have defined a class Test and a method name() to return the u_name attribute of the class. Here, we are demonstrating the usage of function aliasing on the name() method of the test object.
Python3
class Test: def __init__(self): self.u_name = "user-origin" def name(self): return self.u_name# create object of Test classtest = Test()# create function reference and it's aliasname_fn = test.namename_fn_ref = name_fn# this will print user-originprint(name_fn())test.u_name = "user-mod"# this will print user-modprint(name_fn_ref()) |
Output:
user-origin user-mod
Explanation: name_fn is the function reference to the name() method of the test object. name_fn_ref is the function alias of the function name_fn. After changing the attribute value of u_name the function alias also reflects the change that establishes the fact that, name_fn and name_dn_ref points to the same function.
