Error when executing the sample in chapter 4.6

[RustyNail]

Documentation

This is a pull request for the sample code in section 4.6.

I ran the following based on the sample code and got an error.

The sample code in the tutorial may be an excerpt of some code.
However, given that we will try "Point(1, var)" immediately following, I believe the user will easily understand that there is a necessary dataclass import statement.

Executed code :

class Point:
    x: int
    y: int

def where_is(point):
    match point:
        case Point(x=0, y=0):
            print("Origin")
        case Point(x=0, y=y):
            print(f"Y={y}")
        case Point(x=x, y=0):
            print(f"X={x}")
        case Point():
            print("Somewhere else")
        case _:
            print("Not a point")

## Added code
p = Point(1, 1)

Errors that occurred :

    p = Point(1, 1)
        ^^^^^^^^^^^
TypeError: Point() takes no arguments

Linked PRs

• gh-106625 : Add missing code to tutorial 4.6 example #106623
• [3.12] gh-106625 : Add missing code to tutorial 4.6 example (GH-106623) #106636
• [3.11] gh-106625 : Add missing code to tutorial 4.6 example (GH-106623) #106637

[terryjreedy]

Never having used dataclass, I might not have easily guessed.

[hauntsaninja]

Thanks all!