The Purpose of __repr__

The __repr__ method is intended to generate a string representation of an object that ideally serves as a valid Python expression, which could be utilized to recreate the object. This method primarily caters to developers, aiding in debugging and development tasks. By implementing __repr__, you instruct Python on how to succinctly represent an object of your class, ideally providing enough details for object reconstruction.

Example:

class Point:

def __init__(self, x, y):

self.x = x

self.y = y

def __repr__(self):

return f"Point({self.x}, {self.y})"

point = Point(1, 2)

print(repr(point)) # Output: Point(1, 2)

In this illustration, the __repr__ method returns a string closely resembling the construction of the object, offering a clear representation that aids in debugging by revealing the object's state.

The Purpose of __str__

In contrast, the __str__ method is designed to produce a more user-friendly representation of an object, targeting end-users. The string returned by __str__ should be clear and easy to comprehend, making it suitable for display purposes. This method is called when using the print() function or str() on an object.

Example:

class Point:

def __init__(self, x, y):

self.x = x

self.y = y

def __str__(self):

return f"Point located at ({self.x}, {self.y})"

point = Point(1, 2)

print(point) # Output: Point located at (1, 2)

Here, the __str__ method provides a human-readable description of the point, making it more appropriate for end-users who may not be familiar with the underlying code or Python syntax.

When to Utilize Each Method

Determining whether to implement __repr__, __str__, or both in your class depends on your target audience and how you anticipate your objects will be utilized and displayed. As a general guideline:

• Use __repr__ for string representations aimed at developers, debuggers, and loggers.
• Use __str__ for a readable, user-friendly representation intended for end-users.