René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add support for Template type (t-strings) to pprint","articleBody":"# Feature or enhancement\n\n### Proposal:\n\nUpdate [`pprint`](https://docs.python.org/3/library/pprint.html#module-pprint) functions to understand and format `Template` and `Interpolation` types:\n\n```pycon\n\u003e\u003e\u003e from pprint import pp\n\u003e\u003e\u003e name = \"World\"\n\u003e\u003e\u003e pp(t\"Hello {name}\")\nTemplate(strings=('Hello ', ''),\n         interpolations=(Interpolation('World', 'name', None, ''),))\"\"\")\n```\n\nI believe it will be quite common to play with t-strings in the REPL and other dynamic environments, where pretty formatting could help a lot. I don't know how high is the bar for adding types to the `pprint` registry, though.\n\nIf this is deemed worthwhile, I have a [working implementation](https://github.com/python/cpython/commit/628dc27695a15bab284771a608a58e1f6a7bf7ba), pretty straightforward.\n\n---\n\nMore complex examples (inspired from the PEP), to give a sense of what it could look like:\n\n```pycon\n\u003e\u003e\u003e attributes = {\"id\": \"main\"}\n\u003e\u003e\u003e attribute_value = \"shrubbery\"\n\u003e\u003e\u003e content = \"hello\"\n\u003e\u003e\u003e template = t\"\u003cspan {attributes} data-value={attribute_value}\u003e{content}\u003c/span\u003e\"\n\u003e\u003e\u003e pp(template)\nTemplate(strings=('\u003cspan ', ' data-value=', '\u003e', '\u003c/span\u003e'),\n         interpolations=(Interpolation({'id': 'main'}, 'attributes', None, ''),\n                         Interpolation('shrubbery',\n                                       'attribute_value',\n                                       None,\n                                       ''),\n                         Interpolation('hello', 'content', None, '')))\n\u003e\u003e\u003e\n\u003e\u003e\u003e nested = t\"\u003cdiv\u003e{template}\u003c/div\u003e\"\n\u003e\u003e\u003e pp(nested)\nTemplate(strings=('\u003cdiv\u003e', '\u003c/div\u003e'),\n         interpolations=(Interpolation(Template(strings=('\u003cspan ',\n                                                         ' data-value=',\n                                                         '\u003e',\n                                                         '\u003c/span\u003e'),\n                                                interpolations=(Interpolation({'id': 'main'},\n                                                                              'attributes',\n                                                                              None,\n                                                                              ''),\n                                                                Interpolation('shrubbery',\n                                                                              'attribute_value',\n                                                                              None,\n                                                                              ''),\n                                                                Interpolation('hello',\n                                                                              'content',\n                                                                              None,\n                                                                              ''))),\n                                       'template',\n                                       None,\n                                       ''),))\n```\n\nUnfortunately, \"interpolation\" being a quite long word repeated 2 times in the repr of a t-string, with default formatting rules we soon have text crumpled to the right of the screen... but I believe it is still more readable than \n\n```py\nTemplate(strings=('\u003cdiv\u003e', '\u003c/div\u003e'), interpolations=(Interpolation(Template(strings=('\u003cspan ', ' da\nta-value=', '\u003e', '\u003c/span\u003e'), interpolations=(Interpolation({'id': 'main'}, 'attributes', None, ''),  \nInterpolation('shrubbery', 'attribute_value', None, ''), Interpolation('hello', 'content', None, '')\n)), 'template', None, ''),))\n```\n\n### Has this already been discussed elsewhere?\n\nThis is a minor feature, which does not need previous discussion elsewhere\n\n### Links to previous discussion of this feature:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-134577\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/loic-simon","@type":"Person","name":"loic-simon"},"datePublished":"2025-05-22T22:03:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/134551/cpython/issues/134551"}