dataclass definition: "data class fields without default value cannot appear after data fields with default values"

[steersbob]

Environment data

• Language Server version: 2020.7.3 (pyright 5004efe5)
• OS and version: Ubuntu 20.04
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.7.7

Expected behaviour

It being possible to define a dataclass using both uninitialized fields, and fields with a default value.

Actual behaviour

The below snippet has a dataclass field with a default value above fields with init=False.
The definitions for the uninitialized fields generate a Pylance error.

(variable) reset_reason: str
Data class fields without default value cannot appear after data fields with default values

Logs

https://termbin.com/15k2

Code Snippet / Additional information

from dataclasses import dataclass, field

@dataclass
class HandshakeMessage:
    reset_reason_hex: str
    reset_data_hex: str
    device_id: str = field(default='')
    reset_reason: str = field(init=False)
    reset_data: str = field(init=False)

    def __post_init__(self):
        reset_reason = 'calculated value'
        reset_data = 'calculated value'

[erictraut]

Thanks for the bug report. This will be fixed in the next version of Pylance.

[jakebailey]

This issue has been fixed in version 2020.7.4, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/master/CHANGELOG.md#202074-29-july-2020