__add__(), implementation logic for adding two objects of the same class, overrides +
class Myclass(object):
def __init__(self,value):
= value
def __add__(self, other):
return +
if __name__ == '__main__':
o1 = Myclass(1)
o2 = Myclass(2)
print(o1+o2)Print results:
3
self is only its own object, other refers to another object (belonging to the Myclass class).
Difference between "__add__" and "__iadd__" in python
Difference between "__add__" and "__iadd__", both are splice operations.
| add | iadd |
|---|---|
| list | list |
| tuple | – |
In a list, both can be used; in a tuple, only one can be used.
1. __add__ attribute
b = [7, 8, 9, 10, 11, 12] d = [19, 20, 21, 22, 23, 24] # The splice action is performed and the value of the splice is returned g = b.__add__(d) print(g)
The results of the implementation are as follows:
D:\python_env\Scripts\ F:/TESTING/BlogPosts/ReadAndWrite/list_and_tuple.py
[7, 8, 9, 10, 11, 12, 19, 20, 21, 22, 23, 24]Process finished with exit code 0
2. __iadd__ attribute
b = [7, 8, 9, 10, 11, 12] d = [19, 20, 21, 22, 23, 24] # Perform splicing actions, which are spliced in situ h = b.__iadd__(d) print(h)
The results of the implementation are as follows:
D:\python_env\Scripts\ F:/TESTING/BlogPosts/ReadAndWrite/list_and_tuple.py
[7, 8, 9, 10, 11, 12, 19, 20, 21, 22, 23, 24]Process finished with exit code 0
After the above two are executed, found that the results are basically the same, can not see what tricks, so we distinguish between debugging mode, at a glance . The following display:
The above figure is directly returned after executing __add__. The following figure is after the execution of __iadd__, first splice a bit and then return the value, note that it is not return out .
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