Import package from subfolder in Python

Question

(I appreciate there are many similar questions on StackOverflow already, but none seemed to help me.)

I have the following structure:

code/
  foo/
    __init__.py
    foo.py
    bar/
      __init__.py
      bar.py

I want to be able to import foo as a package in bar.py without messing with sys.

This is my foo.py:

hello = 'Hello, world!'

This is my bar.py:

import foo

print(foo.hello)

But if I execute python foo/bar/bar.py I get the following error:

ModuleNotFoundError: No module named 'foo'

Of all things, the one that's driving me crazy the most is that if I add the following snippet on top of bar.py:

import pkgutil

search_path = ['.']
all_modules = [x[1] for x in pkgutil.iter_modules(path=search_path)]
print(all_modules)

Then I actually get foo as an available module (still failing), here:

['foo']
ModuleNotFoundError: No module named 'foo'