Understanding the = Operator in Python
In Python, the = operator is a versatile tool that simplifies code by combining assignment and addition. It is essentially syntactic sugar for the iadd special method. If iadd is not present in a class, add or radd may be used instead.
For example, consider the list object. When you use the = operator on a list, Python iterates over the provided iterable, appending each element to the list. This behavior is similar to the list's extend method.
To illustrate how the iadd method works, let's create a custom class called Adder:
class Adder(object): def __init__(self, num=0): self.num = num def __iadd__(self, other): print('in __iadd__', other) self.num += other return self.num
In this class, the iadd method adds the provided number to the Adder object's num attribute and returns the updated value.
Using the = operator on an Adder object will call the iadd method:
a = Adder(2) a += 3 # Will print "in __iadd__ 3" print(a) # Outputs 5
By customizing the iadd method, you can tailor the addition behavior for your own objects. This adds flexibility and expressiveness to your code.
The above is the detailed content of How Does the = Operator Work with Custom Objects in Python?. For more information, please follow other related articles on the PHP Chinese website!

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