Javascript List Class Methods

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The Arguments in Python methods must be specified in parentheses. This is because functions and methods use parentheses to indicate whether they are called. If you use square brackets to call a method, you will encounter a "TypeError: ’method’ object is notsubscriptable " error .

In this guide, we explain what this error means and why you may encounter it. Let’s look at an example of this error to help you develop a solution.

TypeError: ’method’ the object is not subscribed

The subscribable objects are objects with a __getitem__ method. These are data types such as lists, dictionaries, and tuples. The __getitem__ method allows the Python interpreter to retrieve a single item from a collection.

Not all items are subscribed. Methods, for example, are not. This is because they don’t implement the __getitem__ method. This means that you cannot use the bracketed syntax to access the elements of a method or to call a method.

Consider the following code snippet:

This code returns "Edam", the cheese in position of index 0. You cannot use square brackets to call a function or a method because the functions and methods are not objects to which you can subscribe.

An example scenario

Here we create a program that stores the cheeses in objects. The "Cheese‚" The class we use to define a cheese will have a method that will allow us to check whether a cheese comes from a particular country of origin.

Start with define a class for our cheeses. Let’s call this class Cheese:

Our class contains two methods. The first method defines the structure of the Cheese object. The second allows to check if the country of origin of a cheese is equal to a certain value. < br>

Then , let’s create an object from our Cheese class:

The variable "edam" is an object. The name associated with the cheese is Edam and its country of origin is the Netherlands.

Next, we call our get_country () method:

This code executes the get_country () method of the Cheese class. The get_country ( ) checks if the value of "origin" in our "edam" object is equal to "Germany".

Run our code and see what happens:

An error has occurred in our code.

Let’s analyze the line of code that the Python debugger identified as incorrect:

In this line of code, we use square brackets to call the get_country () method. This is not an acceptable syntax because square brackets are used to access items in a list. Since functions and objects are not subscribed, we cannot use square brackets to call them.

To correct this error, we need to replace the brackets with braces:

Let’s run our code and see what happens:

Our code is working fine. Let’s try to check if Edam is from "The Netherlands" to make sure that our function works in all cases, whether or not the value we specify is the same as the country of origin of the cheese:

Our code returns:

Our code works if the value we specify is equal to the country of origin of a cheese.

Conclusion

The "TypeError: ’method’ not subscribable" error is generated when using square brackets to call a method within a class. To resolve this error, be sure to call only the methods of a class using curly braces after the name of the method you want to call.

You are now ready to resolve this common Python error as a professional programmer !

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We hope this article has helped you to resolve the problem. Apart from Javascript List Class Methods, check other code Python module-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Marie Richtgofen

Milan | 2023-04-01

I was preparing for my coding interview, thanks for clarifying this - Javascript List Class Methods in Python is not the simplest one. Will get back tomorrow with feedback

Olivia Schteiner

London | 2023-04-01

Simply put and clear. Thank you for sharing. Javascript List Class Methods and other issues with struct Python module was always my weak point 😁. Checked yesterday, it works!

Olivia Galleotti

Vigrinia | 2023-04-01

Simply put and clear. Thank you for sharing. Javascript List Class Methods and other issues with Python functions was always my weak point 😁. Will get back tomorrow with feedback

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