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Sir Valecek Luis answered on April 26, 2022 Popularity 8/10 Helpfulness 2/10

answer Python __sub__

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"""
Magic method __sub__ 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 __sub__ method
"""

class Test:
    def __init__(self, x):
        self.x = x
    
    def __sub__(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 subtract 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 use subtraction.
print(t - t2)	# 3, without __sub__ the object doesn't understand the "-" sign.

Popularity 8/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: python

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Contributed on Apr 26 2022

Sir Valecek Luis

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