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Enable --pretty by default #19108

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@JukkaL

Description

@JukkaL
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Feature

Enable --pretty by default. --no-pretty can still be used to get more concise error messages (it already works, so no need to implement it).

--pretty causes mypy to show the line with the error, and mypy will highlight the location on the line where the error was reported:

foo.py:13: error: List item 0 has incompatible type "str"; expected "int"  [list-item]
    aa = ["x"]
          ^~~

Also update documentation, including relevant command-line examples which show the error output from mypy.

Pitch

The additional context makes it easier to see what is wrong. For example, there may be multiple possible expressions which can generate the error, and the highlighting makes this obvious.

Activity

mkaraev

mkaraev commented on May 19, 2025

@mkaraev

@JukkaL can I work on this issue?

wyattscarpenter

wyattscarpenter commented on May 19, 2025

@wyattscarpenter
Contributor

@mkaraev There is no process in the mypy repo for requiring permission to work on an issue. Therefore: you can!

mkaraev

mkaraev commented on May 19, 2025

@mkaraev

Oh, okay. Great then :)

linked a pull request that will close this issue on May 21, 2025
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        Enable --pretty by default · Issue #19108 · python/mypy