The mypy command line - Configuring error messages - 《Mypy 0.770 Documentation》

Configuring error messages

The following flags let you adjust how much detail mypy displaysin error messages.

—show-error-context
This flag will precede all errors with “note” messages explaining thecontext of the error. For example, consider the following program:

class Test:
    def foo(self, x: int) -> int:
        return x + "bar"

Mypy normally displays an error message that looks like this:

main.py:3: error: Unsupported operand types for + ("int" and "str")

If we enable this flag, the error message now looks like this:

main.py: note: In member "foo" of class "Test":
main.py:3: error: Unsupported operand types for + ("int" and "str")

—show-column-numbers
This flag will add column offsets to error messages.For example, the following indicates an error in line 12, column 9(note that column offsets are 0-based):

main.py:12:9: error: Unsupported operand types for / ("int" and "str")

—show-error-codes
This flag will add an error code [<code>] to error messages. The errorcode is shown after each error message:

prog.py:1: error: "str" has no attribute "trim"  [attr-defined]

See Error codes for more information.

—pretty
Use visually nicer output in error messages: use soft word wrap,show source code snippets, and show error location markers.

—no-error-summary
This flag will disable error summary. By default mypy shows a summary lineincluding total number of errors, number of files with errors, and numberof files checked.