Avoiding huge files when following python google-style-guide

Question

Google style guide requires to import modules. Say I have a non trivial class and several non-trivial derived classes. It seems that I have to put them all in the one file otherwise will have to use different prefixes when using them.

Personally I prefer one class per file. Is there a common idiom to avoid unnecessary large files?

E.g. can I rename several imports into one as long as there is no name conflicts?

import data_main as data
import data_derived_a as data
import data_derived_b as data

Answer 1

With modules, no, there's really no way of doing this that I know of. If you're happy to put your class in separate files within a package, though, you can import the individual classes in __init__.py, and your client modules can import them all at once, like so.

# mypackage/a.py
class A:
    pass

# mypackage/b.py
class B:
    pass

# mypackage/__init__.py
from .a import A
from .b import B

# mymodule.py
from mypackage import A, B
a = A()
b = B()

# Or mymodule.py
import mypackage as p
a = p.A()
b = p.B()