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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"dis._try_compile: traceback printed on error in source argument is too wordy","articleBody":"`_try_compile` function from `dis` module firstly tries to compile given source string with `'eval'` mode and, if exception is occured, catches it and tries again with `'exec'` mode. These actions lead to a long chained traceback if given string contains syntax/indentation error, because this string gets refused by `compile` in both `'eval'` and `'exec'` modes.\r\nAll functions/constructors from `dis` module that use `_try_compile` and accept source string as an argument (`dis`, `get_instructions`, `code_info`, `show_code`, `Bytecode`) are showing this behavior:\r\n```python\r\n\u003e\u003e\u003e dis.dis(')')\r\nTraceback (most recent call last):\r\n  File \"/home/.../cpython/Lib/dis.py\", line 67, in _try_compile\r\n    c = compile(source, name, 'eval')\r\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"\u003cdis\u003e\", line 1\r\n    )\r\n    ^\r\nSyntaxError: unmatched ')'\r\n\r\nDuring handling of the above exception, another exception occurred:\r\n\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/home/.../cpython/Lib/dis.py\", line 112, in dis\r\n    _disassemble_str(x, file=file, depth=depth, show_caches=show_caches, adaptive=adaptive)\r\n  File \"/home/.../cpython/Lib/dis.py\", line 593, in _disassemble_str\r\n    _disassemble_recursive(_try_compile(source, '\u003cdis\u003e'), **kwargs)\r\n                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/home/.../cpython/Lib/dis.py\", line 69, in _try_compile\r\n    c = compile(source, name, 'exec')\r\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"\u003cdis\u003e\", line 1\r\n    )\r\n    ^\r\nSyntaxError: unmatched ')'\r\n```\r\nPython versions affected: 3.10.8, 3.11.0, current main.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102115\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/chgnrdv","@type":"Person","name":"chgnrdv"},"datePublished":"2023-02-21T14:26:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/102114/cpython/issues/102114"}