[Sqlalchemy-tickets] Issue #3539: TypeError in sqlalchemy.orm.strategy_options.Load.__str__ under certain conditions (zzzeek/sqlalchemy)

[vr2262 <iss...@bi...>]

New issue 3539: TypeError in sqlalchemy.orm.strategy_options.Load.__str__ under certain conditions
https://bitbucket.org/zzzeek/sqlalchemy/issues/3539/typeerror-in

vr2262:

The `__str__` method for this class is defined on line 182 here:

https://bitbucket.org/zzzeek/sqlalchemy/src/50866d2f857dd45bb2d186a0fa076768437d62a3/lib/sqlalchemy/orm/strategy_options.py?fileviewer=file-view-default#strategy_options.py-182:183

I encountered this logging error:

`TypeError: not all arguments converted during string formatting`

Upon inspection, the value of `self.strategy` was

```
#!python
(('deferred', False), ('instrument', True))
```

The really strange thing is that I only saw this error when trying to configure logging. Up until this point, I had been using `create_engine(echo=True)` and never encountered this error.