pypa/pip · error · CommandError

--no-binary / --only-binary option requires 1 argument.

Error message

--no-binary / --only-binary option requires 1 argument.

What it means

Error "--no-binary / --only-binary option requires 1 argument." thrown in pypa/pip.

Source

Thrown at src/pip/_internal/models/format_control.py:41

        self.no_binary = no_binary
        self.only_binary = only_binary

    def __eq__(self, other: object) -> bool:
        if not isinstance(other, self.__class__):
            return NotImplemented

        if self.__slots__ != other.__slots__:
            return False

        return all(getattr(self, k) == getattr(other, k) for k in self.__slots__)

    def __repr__(self) -> str:
        return f"{self.__class__.__name__}({self.no_binary}, {self.only_binary})"

    @staticmethod
    def handle_mutual_excludes(value: str, target: set[str], other: set[str]) -> None:
        if value.startswith("-"):
            raise CommandError(
                "--no-binary / --only-binary option requires 1 argument."
            )
        new = value.split(",")
        while ":all:" in new:
            other.clear()
            target.clear()
            target.add(":all:")
            del new[: new.index(":all:") + 1]
            # Without a none, we want to discard everything as :all: covers it
            if ":none:" not in new:
                return
        for name in new:
            if name == ":none:":
                target.clear()
                continue
            name = canonicalize_name(name)
            other.discard(name)
            target.add(name)

View on GitHub (pinned to d7d0d0a394)

When it happens

Trigger: Thrown at src/pip/_internal/models/format_control.py:41 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of pypa/pip@d7d0d0a394 (2026-08-04). Data as JSON: /data/errors/2ead8628a8997154.json. Report an issue: GitHub.