How do you call the __str__ method?

Short Answer

Expert verified
Explain how to call the `__str__` method in a Python class. To call the `__str__` method in a Python class, follow these steps: 1. Create a class with the `__str__` method. 2. Create an instance of the class. 3. Call the `__str__` method implicitly using built-in Python functions like `print()` or `str()`. 4. Alternatively, call the `__str__` method explicitly by directly calling the method on the instance. For example, if we create a 'Student' class with a `__str__` method that returns the student's name and age, we can call the method implicitly using `print(student1)` or explicitly using `student1.__str__()`. Both methods will return the same human-readable representation of the object.

Step by step solution

01

Create a class with the __str__ method

To use the `__str__` method, first, you need to create a Python class that implements the `__str__` method. In this example, let's create a class named 'Student' with a 'name' and 'age' attribute and define the `__str__` method that returns the name and age of the student as a string: ```python class Student: def __init__(self, name, age): self.name = name self.age = age def __str__(self): return f"Student(name={self.name}, age={self.age})" ```
02

Create an instance of the class

Next, create an instance of the 'Student' class by providing the necessary arguments in the constructor: ```python student1 = Student("Alice", 18) ```
03

Call the __str__ method implicitly

The `__str__` method is usually called implicitly when we use built-in Python functions like `print()` or `str()`. In this case, call the `__str__` method by using the `print()` function: ```python print(student1) ``` This will output: ``` Student(name=Alice, age=18) ```
04

Call the __str__ method explicitly

In some cases, you might want to call the `__str__` method explicitly. To do this, directly call the `__str__` method on the instance: ```python student_str = student1.__str__() print(student_str) ``` This will also output: ``` Student(name=Alice, age=18) ```

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