Format string in Python

Conversion flag

Conversion flag can be appended to the value like so:

f'Vector({self.x!r}, {self.y!r})'

Three conversion flags are currently supported:

• '!s' which calls str() on the value
• '!r' - repr()
• '!a' - ascii(). https://docs.python.org/3.10/library/string.html#format-string-syntax