python call method by name
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title: python tutorial - calling a method by name
introduction:
in python, it is possible to dynamically call a method by its name using the getattr() function and the function call operator (). this can be useful in scenarios where the method to be called is determined at runtime or when dealing with dynamic code.
let's explore how to achieve this using a simple example.
example scenario:
suppose you have a class calculator with methods for basic arithmetic operations: add, subtract, multiply, and divide.
now, let's create a function that can dynamically call any of these methods by name.
explanation:
the call_method_by_name function takes an object (obj), the method name (method_name), and any additional arguments and keyword arguments.
using hasattr(), it checks if the object has the specified method.
if the method exists, getattr() is used to retrieve the method by name.
it then checks if the retrieved method is callable using the callable() function.
if the method is callable, it is invoked with the provided arguments and keyword arguments.
the example demonstrates calling the 'add' and 'multiply' methods dynamically, showcasing the flexibility of this approach.
conclusion:
dynamic method invocation by name can be a powerful tool in python, allowing you to build more flexible and dynamic code. however, it should be used judiciously to maintain code readability and avoid potential pitfalls.
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