Trying to print Stream object when not in ExecutionContext raises assertion

[cboulay]

ezmsg.core.stream.Stream overrides its __repr__ which includes its self.address. self.address is a property inherited from the parent Addressable class. address is a simple construct usingself.location. If self.location is None then an AssertionError is raised upon its access.

location is None unless it has had its _set_location called, which afaict only happens during ExecutionContext.setup.

Reproduce with:

import typing

import ezmsg.core as ez
from ezmsg.util.debuglog import DebugLog

try:
    print(DebugLog.INPUT)
    # Same if print(DebugLog().INPUT)
except AssertionError as e:
    print("Cannot print Stream object")

stream_obj = ez.stream.Stream(typing.Any)
try:
    print(stream_obj)
except AssertionError as e:
    print("Cannot print Stream object")

[cboulay]

I'm guessing that raising the AssertionError when self.location is None is intentional (it's explicitly tested in the unit tests).

So maybe this should only be fixed at the Stream.__repr__ level.

Instead of

    def __repr__(self) -> str:
        return f"Stream:{self.address}[{self.msg_type}]"

We can use

    def __repr__(self) -> str:
        _addr = self.address if self._location is not None else "unlocated"
        return f"Stream:{_addr}[{self.msg_type}]"

The above test then prints

InputStream:unlocated[typing.Any]()
Stream:unlocated[typing.Any]