redis/redis-py · error · NotImplementedError

MEMORY HELP is intentionally not implemented in the client…

Error message

MEMORY HELP is intentionally not implemented in the client. For more information, see https://redis.io/commands/memory-help

What it means

Raised by memory_help() (redis/commands/core.py:1877) which is a stub that unconditionally raises NotImplementedError. MEMORY HELP prints CLI help text and has no programmatic value, so the python client refuses it. No arguments are accepted.

Solutions

Consult https://redis.io/commands/#memory for the MEMORY command list
Call the implemented memory_* methods directly (memory_stats, memory_usage, memory_purge)
If you must: r.execute_command("MEMORY", "HELP")

Example fix

# before
r.memory_help()
# after
# (remove; no programmatic equivalent needed)
r.memory_stats()

Defensive patterns

Strategy: fallback

Validate before calling

# memory_help() is intentionally unimplemented; no programmatic equivalent needed
# enumerate supported methods instead

Try / catch

try:
    r.memory_help()
except NotImplementedError:
    pass  # nothing useful to do

Prevention

Do not call memory_help(); it returns CLI help text.
Reference the redis.io docs for the MEMORY command surface.
Use the implemented memory_* methods directly.

When it happens

Trigger: Calling r.memory_help(). Any call raises immediately.

Common situations: Auto-discovering MEMORY subcommands; assuming a 1:1 mirror of the CLI surface.

Related errors

AI-assisted analysis of redis/redis-py@6a6b581b48 (2026-08-10). Data as JSON: /api/errors/e6c63f36928672ee. Report an issue: GitHub.

Appendix: source

Thrown at redis/commands/core.py:1877

    def object(self, infotype: str, key: KeyT, **kwargs) -> Any | Awaitable[Any]:
        """
        Return the encoding, idletime, or refcount about the key
        """
        return self.execute_command(
            "OBJECT", infotype, key, infotype=infotype, **kwargs
        )

    def memory_doctor(self, **kwargs) -> None:
        raise NotImplementedError(
            """
            MEMORY DOCTOR is intentionally not implemented in the client.

            For more information, see https://redis.io/commands/memory-doctor
            """
        )

    def memory_help(self, **kwargs) -> None:
        raise NotImplementedError(
            """
            MEMORY HELP is intentionally not implemented in the client.

            For more information, see https://redis.io/commands/memory-help
            """
        )

    @overload
    def memory_stats(self: SyncClientProtocol, **kwargs) -> dict[str, Any]: ...

    @overload
    def memory_stats(
        self: AsyncClientProtocol, **kwargs
    ) -> Awaitable[dict[str, Any]]: ...

    def memory_stats(self, **kwargs) -> dict[str, Any] | Awaitable[dict[str, Any]]:
        """
        Return a dictionary of memory stats

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