Are PEP-249 "rules" that Python database modules (eg psycopg) should follow?
Is PEP-249 not any Python code, class or something that can be "touchable", or something that is already (natively) inside Python itself?
Is PEP-249 a basis for the database modules that will be used by the Python language?
Taken from PEP-249 introduction:
This API has been defined to encourage similarity between the Python modules that are used to access databases. By doing this, we hope to achieve a consistency leading to more easily understood modules, code that is generally more portable across databases, and a broader reach of database connectivity from Python.
PEPs, i.e. Python Enhancement Proposals, are just that: proposals (see PEP-1). In this case, it's a proposal of a standard, "canonical" API design for database libraries. It isn't necessarily a "law of the land", but rather a reference for people who build such APIs.
The community has come together, decided that it might be a good idea to come up with something common, and put it up as a PEP. The PEP got accepted, and now it will be seen as a kind of a standard.
Whether or not this standard is followed is in the hands of the maintainers of each particular library. It's all a matter of agreement between developers.
