What does !r mean in Python? [duplicate]

Question

I have found the following code in a project.

What does the !r part mean?

def __repr__(self):
    return f"user={self.user!r}, variant={self.variant!r}"

Answer 1

By default an f-string displays the result of calling str on the values inside the curly braces. Specifying !r displays the result of calling repr instead.

From the docs

The conversion field causes a type coercion before formatting. Normally, the job of formatting a value is done by the format() method of the value itself. However, in some cases it is desirable to force a type to be formatted as a string, overriding its own definition of formatting. By converting the value to a string before calling format(), the normal formatting logic is bypassed.

Three conversion flags are currently supported: '!s' which calls str() on the value, '!r' which calls repr() and '!a' which calls ascii().