change the name of an instance based on condition in python

Assuming that you are referring to renaming an object instance in Python based on a certain condition, you can achieve this by using the assignment operator = to assign a new name to the instance.

Here is an example:

main.py
class MyClass:
    def __init__(self, name):
        self.name = name
        
    def rename(self, new_name):
        if len(new_name) > 10:
            self.name = new_name
            return True
        else:
            return False

# creating an instance of MyClass with name 'john'
obj = MyClass('john')

# renaming the instance to 'john doe' based on condition 
new_name = 'john doe'
if obj.rename(new_name):
    obj = MyClass(new_name)

# printing the new name of the instance
print(obj.name)
503 chars
22 lines

In this example, the rename() method checks if the length of the new name is greater than 10 characters. If it is, then the method assigns the new name to the instance by updating the self.name attribute. If the condition is not satisfied, the method returns False and the instance is not renamed.

To actually rename the instance, you can simply reassign a new instance of the class to the same variable name. In the example above, obj is reassigned to a new instance of MyClass with the updated name. This effectively renames the instance.