“Python comment utiliser __mul__” Réponses codées

Python comment utiliser __mul__

"""
Magic method __mul__ is called when a "*" is used on any object. 
Given example shows what I mean: print(some_object * other_object)
This may give error often, so that means given objects don't have __mul__ method
"""

class Test:
    def __init__(self, x):
        self.x = x
    
    def __mul__(self, other):
    	""" 
    	self represents the object that is first and other is object after
    	"*" sign. What I say here is that I expect to have attribute "x" 
    	in both objects and I will try to multiply them. This SHOULD BE
    	used for objects of the same type.
    	"""
    	return self.x * other.x

t = Test(5)
t2 = Test(2)	# Now I can multiply these two objects together.
print(t * t2)	# 10, without __mul__ the object doesn't understand the "*" sign.