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By using the dataclass module, we can create custom types from existing values, thus simplifying the code and improving readability: Import the dataclass module. Use the @dataclass decorator to create a custom type and specify the type attributes. Instantiate a custom type using an existing value. Access and manipulate properties in custom types. By creating a custom type from an existing class, we can preserve the methods and properties of the class.
#How to create a custom type from an existing value?
Custom types can help us group data and represent their properties. We can create custom types using existing values, thus simplifying the code and improving readability.
Python
In Python, it is simple to create a custom type using dataclass
:
from dataclasses import dataclass @dataclass class Coords: x: int y: int c = Coords(10, 20) print(c.x) # 输出 10 print(c.y) # 输出 20
Practical case
Suppose we have a Point
class with x
and y
properties:
class Point: def __init__(self, x, y): self.x = x self.y = y
We can use This class creates a custom type:
from dataclasses import dataclass @dataclass class CustomPoint(Point): pass p = CustomPoint(10, 20) print(p.x) # 输出 10 print(p.y) # 输出 20
By creating a custom type from an existing class, we retain the methods and properties of the class while also getting the benefits of dataclass
.
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