Extend the rules for f-strings to t-strings

[j2cry]

Rule request

Extend the rules for f-strings to t-strings

Thesis & Reasoning

t-strings are pretty close to f-strings, so the same rules should be applied to them.

Caution

This is only applicable for python >=3.14

[sobolevn]

Do we need any extra specific rules?

[j2cry]

I don't think so. The syntax is exactly the same. The differences between them in AST that I have found are as follows

• top-level class is TemplateStr instead of JoinedStr
• use of class Interpolation instead of FormattedValue
  but, Interpolation instance has format_spec (of type JoinedStr | None) and conversion attributes, just like the f-string

node = ast.parse("f'{value!r:_^20}'").body[0].value
print(ast.dump(node, indent=4))
node = ast.parse("t'{value!r:_^20}'").body[0].value
print(ast.dump(node, indent=4))

Output:

# f-string output
JoinedStr(
    values=[
        FormattedValue(
            value=Name(id='value', ctx=Load()),
            conversion=114,
            format_spec=JoinedStr(
                values=[
                    Constant(value='_^20')]))])
# t-string output
TemplateStr(
    values=[
        Interpolation(
            value=Name(id='value', ctx=Load()),
            str='value',
            conversion=114,
            format_spec=JoinedStr(
                values=[
                    Constant(value='_^20')]))])