{"record":{"id":"6df38e80972c6d19","repo":"pandas-dev/pandas","slug":"you-must-specify-at-least-4-characters-when-resett","errorCode":null,"errorMessage":"You must specify at least 4 characters when resetting multiple keys, use the special keyword \"all\" to reset all the options to their default value","messagePattern":"You must specify at least 4 characters when resetting multiple keys, use the special keyword \"all\" to reset all the options to their default value","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"pandas/_config/config.py","lineNumber":392,"sourceCode":"    set_option : Set the value of the specified option or options.\n    describe_option : Print the description for one or more registered options.\n\n    Notes\n    -----\n    For all available options, please view the\n    :ref:`User Guide <options.available>`.\n\n    Examples\n    --------\n    >>> pd.reset_option(\"display.max_columns\")  # doctest: +SKIP\n    \"\"\"\n    keys = _select_options(pat)\n\n    if len(keys) == 0:\n        raise OptionError(f\"No such keys(s) for {pat=}\")\n\n    if len(keys) > 1 and len(pat) < 4 and pat != \"all\":\n        raise ValueError(\n            \"You must specify at least 4 characters when \"\n            \"resetting multiple keys, use the special keyword \"\n            '\"all\" to reset all the options to their default value'\n        )\n\n    for k in keys:\n        set_option(k, _registered_options[k].defval)\n\n\ndef get_default_val(pat: str) -> Any:\n    key = _get_single_key(pat)\n    opt = _get_registered_option(key)\n    assert opt is not None\n    return opt.defval\n\n\nclass DictWrapper:\n    \"\"\"provide attribute-style access to a nested dict\"\"\"","sourceCodeStart":374,"sourceCodeEnd":410,"githubUrl":"https://github.com/pandas-dev/pandas/blob/71959b8cb9b2459c16e14b34f28b178ccfe14735/pandas/_config/config.py#L374-L410","documentation":"Raised by reset_option (config.py:391-396) as a ValueError when the pattern matches multiple keys, is shorter than 4 characters, and is not the reserved 'all'. This guard prevents accidentally resetting a huge swath of options via an overly short prefix like 'di'.","triggerScenarios":"pd.reset_option('di') or pd.reset_option('mode') where several keys match and the pattern is under 4 chars.","commonSituations":"Trying to batch-reset a namespace using a short prefix without realizing how broad the match is.","solutions":["Use a longer, unambiguous pattern (>=4 chars), e.g. pd.reset_option('display').","Use the fully-qualified key to reset a single option.","Use pd.reset_option('all') if you genuinely want to reset every option."],"exampleFix":"# before\npd.reset_option('di')  # ValueError: You must specify at least 4 characters...\n\n# after\npd.reset_option('display')","handlingStrategy":"validation","validationCode":"def safe_reset(pat: str) -> None:\n    import pandas._config.config as cf\n    keys = cf._select_options(pat)\n    if len(keys) > 1 and len(pat) < 4 and pat != 'all':\n        raise ValueError(f'Pattern {pat!r} too short; use a longer prefix or \"all\"')\n    pd.reset_option(pat)","typeGuard":null,"tryCatchPattern":"try:\n    pd.reset_option(pat)\nexcept ValueError as e:\n    if 'at least 4 characters' in str(e):\n        pd.reset_option('all')  # or pick a longer prefix","preventionTips":["Never use sub-4-char patterns for batch resets.","Reset whole namespaces via the namespace name (>=4 chars) where possible.","Document the 'all' escape hatch for users who want a full reset."],"tags":["config","reset-option","safety-guard"],"analyzedSha":"71959b8cb9b2459c16e14b34f28b178ccfe14735","analyzedAt":"2026-08-07T01:30:20.476Z","schemaVersion":2},"datasetVersion":"2026-08-07T03:17:09.362Z"}