René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ValueError: invalid conversion flag","articleBody":"Hi! After latest fixes xonsh is working more and more stable so I've mentioned RustPython in xonsh README, thanks!\n\nrc.xsh:\n```xsh\n@aliases.register\ndef _als():\n    a = 1\n    b = f\"{a!r}\"  # `!r` produces the exception\n```\nrun:\n```xsh\nrustpython -V\n# Python 3.13.0alpha (heads/master:40acd5529\n\n/.local/bin/rust-xonsh --rc rc.xsh\n```\nresult:\n```xsh\nTraceback (most recent call last):\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py\", line 511, in main\n    args = premain(argv)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py\", line 452, in premain\n    start_services(shell_kwargs, args, pre_env=pre_env)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py\", line 375, in start_services\n    _load_rc_files(shell_kwargs, args, env, execer, ctx)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py\", line 330, in _load_rc_files\n    rcfiles=rc, rcdirs=rcd, execer=execer, ctx=ctx, env=env, login=login\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/environ.py\", line 2656, in xonshrc_context\n    rcfile, ctx, env, execer=execer, login=login\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/environ.py\", line 2714, in xonsh_script_run_control\n    with swap_values(ctx, updates):\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/environ.py\", line 2718, in xonsh_script_run_control\n    exc_info = sys.exc_info()\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/environ.py\", line 2716, in xonsh_script_run_control\n    exc_info = run_script_with_cache(filename, execer, ctx)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/codecache.py\", line 176, in run_script_with_cache\n    ccode = compile_code(filename, code, execer, glb, loc, mode)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/codecache.py\", line 138, in compile_code\n    execer.filename = old_filename\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/codecache.py\", line 136, in compile_code\n    raise\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/codecache.py\", line 134, in compile_code\n    ccode = execer.compile(code, glbs=glb, locs=loc, mode=mode, filename=filename)\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/execer.py\", line 148, in compile\n    raise e\n  File \"/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/execer.py\", line 137, in compile\n    code = compile(tree, filename, mode)\nValueError: invalid conversion flag\n```","author":{"url":"https://github.com/anki-code","@type":"Person","name":"anki-code"},"datePublished":"2025-12-25T16:58:12.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/6533/RustPython/issues/6533"}