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What I'm doing wrong while using __init__.py?

I have the following project structure:
stages
--Transform
----__init__.py
----Transformer.py
----PDFTransformer.py
core.py
I would like to import PDFTransformer like this:
from stages.Transform import PDFTransformer
Therefore I have created stages/Transform/__init__.py with the following content in it:
from .Transformer import Transformer
from .PDFTransformer import PDFTransformer
But python interpreter throws the following error (in PDFTransformer.py):
ModuleNotFoundError: No module named 'Transformer'
The PDFTransformer.py includes the following:
import Transformer
class PDFTransformer (Transformer):
pass
What I`m doing wrong?

If you ask Python to import Transformer from PDFTransformer.py, but when PDFTransformer.py is imported from core.py - i.e. when core.py is the __main__ file - then the import Transformer is relative to core.py
In other words it is as if you wrote import Transformer in core.py. That obviously wouldn't work.
Instead in PDFTransformer.py put from . import Transformer, and it will import Transformer.py

add __all__ =['Transformer', 'PDFTransformer'] in stages/Transform/__init__.py file.
so this __init__.py file would be like
from .Transformer import Transformer
from .PDFTransformer import PDFTransformer
__all__ =['Transformer', 'PDFTransformer']
this tell the python to load these function when you do from stages.Transform import PDFTransformer

Import variables from a config File

I have a script that have multiple files and a config file with all the variables store in one Python file.
Folder structure:
Config file:
If I try to run the main file which calls the head function imported, an error pops up saying that the config cannot be imported.
Imports:

Your Functions folder has a __init__.py file. If your app executes from Main.py (ie if Main.py satisfies __name__ == "__main__") therefore wherever you are in your app you could import the config like this:
from Functions.Config import *
Edit:
However,from module import * is not recommended with local import. You could give an alias to the import and call name.variable instead of calling name directly.
Example:
def head():
# import packages
import Function.Config as conf
print(conf.more_200)
head()
>>> 50

Your syntax are wrong.
It is supposed to be from Config import * and not import .Config import *

Can't import modules in Python?

I'm following instructions and using files from: https://github.com/eBay/ebay-oauth-python-client
I'm getting error when I import: oauth2api, credentialutil, & model. This is step 3 in the above site.
import yaml, json
sys.path.insert(0, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient/model')
sys.path.insert(1, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/test')
sys.path.insert(2, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient')
import credentialutil
import model
import oauth2api
print(sys.path)
error message:
C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\python.exe C:/Users/kyle/PycharmProjects/app/app.py
Traceback (most recent call last):
File "C:/Users/kyle/PycharmProjects/app/app.py", line 10, in
import credentialutil
File "/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient\credentialutil.py", line 20, in
from model.model import environment, credentials
ModuleNotFoundError: No module named 'model.model'; 'model' is not a package
Process finished with exit code 1
The code runs if I only import model:
import yaml, json
sys.path.insert(0, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient/model')
sys.path.insert(1, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/test')
sys.path.insert(2, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient')
import model
print(sys.path)
no error message:
C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\python.exe C:/Users/kyle/PycharmProjects/app/app.py
['/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient/model', '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/test', '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient', 'C:\Users\kyle\PycharmProjects\app', 'C:\Users\kyle\PycharmProjects\app', 'C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\python38.zip', 'C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\DLLs', 'C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\lib', 'C:\Users\kyle\AppData\Local\Programs\Python\Python38-32', 'C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\lib\site-packages', 'C:\Users\kyle\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pymodel']
Process finished with exit code 0
I'm also getting a green line under oauthclient, and I don't know why. Everything is spelled correctly.
sys.path.insert(0, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient/model')
sys.path.insert(2, '/Users/kyle/PycharmProjects/app/ebay-oauth-python-client-master/oauthclient')

I can see two problems.
First, it seems that you are using Python under Windows, but you tried to insert a MacOS path to sys.path. Are you sure that paths like /Users/kyle/... really exist in your file system?
Second, you only need to insert the parent path, i.e. /path/to/ebay-oauth-python-client/oauthclient to your sys.path. In my local test, this works:
import yaml, json
import sys
sys.path.insert(0, r"C:\Users\guosh\Downloads\test\ebay-oauth-python-client\oauthclient")
import credentialutil
import model
import oauth2api
print(sys.path)
However, I would suggest you import the package as a whole, like below:
import yaml, json
import sys
sys.path.insert(0, r"C:\Users\guosh\Downloads\test\ebay-oauth-python-client")
import oauthclient
print(sys.path)

No module found error when I have added the path

I have a project structure that looks like:
The file greet.py is given as:
def greet_morning(message):
print("Hello, {}", message)
def greet_evening(message):
print("Evening message: {}", message)
and the file msg.py is given as :
import sys
import os
sys.path.append(os.getcwd())
from greet.greet import greet_morning
greet_morning("heyy")
When I try to run msg.py as python message/msg.py, I get an error saying ImportError: No module named greet.greet. I am running this file from the root. Why do I get this error, when I have already added the cwd in the system path?

I think is
from untitled.greet.greet import greet_morning
if still doesnt work, add:
import sys
sys.path.append('../')
edit
I think you may find all the possible solutions here Importing files from different folder

add __init__.py inside greet and msg folder__init__.py

You have missed the file __init__.py in your module.
Just create an empty file __init__.py in greet folder.

Python : Cannot find any functions within my own module?

I have created my own module with filename mymodule.py. The file contains:
def testmod():
print "test module success"
I have placed this file within /Library/Python/2.7/site-packages/mymodule/mymodule.py
I have also added a __init__.py file, these have compiled to generate
__init__.pyc and mymodule.pyc
Then in the python console I import it
import mymodule
which works fine
when I try to use mymodule.testmod() I get the following error:
AttributeError: 'module' object has no attribute 'testmod'
So yeah it seems like it has no functions?

You have a package mymodule, containing a module mymodule. The function is part of the module, not the package.
Import the module:
import mymodule.mymodule
and reference the function on that:
mymodule.mymodule.testmod()
You can use from ... import and import ... as to influence what gets imported exactly:
from mymodule import mymodule
mymodule.testmod()
or
from mymodule import mymodule as nestedmodule
nestedmodule.testmod
or
from mymodule.mymodule import testmod
testmod()
etc.