Conan should let my recipe inherit its package name and version

[thejohnfreeman]

To help us debug your issue please explain:

• I've read the CONTRIBUTING guide.
• I've specified the Conan version, operating system version and any tool that can be relevant.
• I've explained the steps to reproduce the error or the motivation/use case of the question/suggestion.

Conan: 1.15.0
OS: Ubuntu 18.04
Python: 3.7.1

My recipe wants to inherit its package name and version from a class that knows how to get them, but Conan refuses to create the package because (I believe) it uses astroid to parse the recipe script and see if there is a name and version attribute set directly on the recipe class. Please just run the recipe and fail if there really is no name or version.

# test.py
from conans import ConanFile

class Foo:
    name = 'foo'
    version = '1.2.3'

class Recipe(Foo, ConanFile):
    pass

$ conan create test.py demo/testing
ERROR: conanfile didn't specify name
$ python -c 'import test; print(test.Recipe.name); print(test.Recipe.version)'
foo
1.2.3

I shouldn't have to do this.

# fixed.py
from conans import ConanFile

class Foo:
    name = 'foo'
    version = '1.2.3'

class Recipe(Foo, ConanFile):
    name = Foo.name
    version = Foo.version

[memsharded]

This has a reason: inheriting automatically the name and version of a base class was very confusing and problematic, because the main case of inheriting a base class is via python_requires, and in that case, the name and version are the name and version of the python-require'd package, which is not what you want.

I think allowing this would be breaking behavior for those users and cannot be changed, unless until the python-requires issue (#4635) has been addressed (and no earlier than Conan 2.0, to be able to change this)

[memsharded]

    def test(self):
        c = TestClient()
        conanfile = textwrap.dedent("""
            from conan import ConanFile

            class Foo:
                name = 'foo'
                version = '1.2.3'

            class Recipe(Foo, ConanFile):
                pass
                """)
        c.save({"conanfile.py": conanfile})
        c.run("create .")

Works in Conan 2.0
Closing ticket as solved