Dataclass with distance in Python

Dataclasses cut the boilerplate out of small value classes.

from dataclasses import dataclass

@dataclass
class Point:
    x: float
    y: float

    def distance_to(self, other):
        return ((self.x - other.x) ** 2 + (self.y - other.y) ** 2) ** 0.5

How it works

1. @dataclass writes __init__ and friends for free.
2. Stores x and y coordinates.
3. distance_to applies the Pythagorean theorem between two points.

Keywords and builtins used here

• Point
• class
• def
• distance_to
• float
• return
• self

The run, in numbers

Lines

9

Characters to type

173

Tokens

53

Three-star pace

100 tpm

At the three-star pace of 100 tokens a minute, this run takes about 32 seconds.

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Step 4 of 4 in Typing & dataclasses, step 23 of 53 in Pythonic Python.

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