python : importing from parent init.py file?

Question

I have defined a method foo and a class bar that has a method foo_bar in __init__.py file

dir/
   __init__.py
   runme.py

Now I want to import __init__.py from runme.py

I have tried

# in runme.py

from . import foo

foo()

and

import foo

foo()

But neither works. I'm using Python 3.7 and Windows 10 Home

I have read How to import classes defined in __init__.py and done some research.

Python's exception is:

ImportError: attempted relative import with no known parent package

# __ init __.py 

def foo():
   print("Im Foo") 
class bar:
    def __init__():
        pass
    def foo_bar(self):
        print("Im Foo_Bar in class bar")

Other options are available if its not possible i will change the file — Zer0, Jun 14 '20 at 13:25
`dir` is a built-in function, so it's a bad idea to name a package or a module `dir`. — Laurent LAPORTE, Jun 14 '20 at 13:28
You should use CamelCase for class names, so `class bar` becomes `class Bar`. See https://pep8.org/#class-names — Laurent LAPORTE, Jun 14 '20 at 13:36

Laurent LAPORTE · Accepted Answer · 2020-06-14T14:13:51.183

1

If pkg is your main packages, you can import it (aka the pkg/__init__.py file) doing:

import pkg

If you want the foo_bar function in this package, you can write:

from pkg import foo_bar

So, in runme.py module, you can do:

from pkg import foo_bar

foo_bar(...)

Of course, you need to call your runme.py module from the root directory (the parent of pkg directory):

python pkg/runme.py
# or
python -m pkg.runme

Please, consider reading Executing modules as scripts

EDIT 1

You can add your project root directory to sys.path:

# in `runme.py`:
def _fix_sys_path():
    import os
    import sys

    HERE = os.path.abspath(os.path.dirname(__file__))  # /path/to/project_dir/pkg
    PROJECT_DIR = os.path.dirname(HERE)  # /path/to/project_dir
    sys.path.insert(0, PROJECT_DIR)


_fix_sys_path()
from pkg import foo_bar

foo_bar(...)

edited Jun 14 '20 at 14:13

answered Jun 14 '20 at 13:33

Laurent LAPORTE

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it is going to be a pip package in that case does it work ??? – Zer0 Jun 14 '20 at 13:36
`pip` is a tool used to install Python packages, not to create it. Consider reading [Packaging Python Projects](https://packaging.python.org/tutorials/packaging-projects/#packaging-python-projects) – Laurent LAPORTE Jun 14 '20 at 13:40
i know all these . i have 3 packages . it is going to be an update for one – Zer0 Jun 14 '20 at 13:43
i sayd because i cant tell the client to go back a level and run it – Zer0 Jun 14 '20 at 13:44
if anyone need more information about the problem only say i will add more information – Zer0 Jun 14 '20 at 13:50
1

You can add your project root directory to `sys.path`, see EDIT 1 – Laurent LAPORTE Jun 14 '20 at 14:13
is your updated answer going to work when a client installs it with pip – Zer0 Jun 14 '20 at 14:16
thanks i tested it it works for i in range(1, 1000):print("Hurray!!!!" – Zer0 Jun 14 '20 at 14:19
someone close it i got my answer – Zer0 Jun 14 '20 at 14:22

python : importing from parent __init__.py file?

1 Answers1

python : importing from parent init.py file?