i.e. Magic Methods
These methods give us complete control over the various high-level interfaces that we use to interact with objects.
They’re meant to be called by the Python interpreter (not me):
# I don't write
my_object.__len__()
# I write
len(my_object)
The only special method that is frequently called by user code directly is __init__ to invoke the initializer.
__repr__ operator gets the string representation of the object for inspection. When __str__ (implicitly used by the print function) is not available, Python will call __repr__ as a fallback.
Resources:
Special Methods
The difference between __str__ and __repr__.