Use interned versions of string constants if they're already present

Feature or enhancement

Proposal:

For now intern_constants function in Objects/codeobject.c uses should_intern_string to check if that string should be interned. And do nothing if should_intern_string returned 0. Maybe it'll be better to check if this string already have interned variant and use it if present? Because there's no need to keep equal strings in memory. The small downside is some time needed for this checking.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-140688

從 Objects/codeobject.c 中的 intern_constants 開始，追蹤 should_intern_string 目前如何判斷字串是否會被 intern。在開始之前查看連結的 PR gh-140688，並在能夠重用現有的 intern 等價字串且不再保留重複的相同字串時，視為工作完成。