ModuleNotFoundError: No module named 'data_management' in PyCharm

Question

In github there are four py Data which I put on my PyCharm. When I run main.py I get this message:

/Users/Armut/Desktop/High_D/Coursera/bin/python /Users/Armut/Desktop/High_D/main.py
Traceback (most recent call last):
  File "/Users/Armut/Desktop/High_D/main.py", line 6, in <module>
    from data_management.read_csv import *
ModuleNotFoundError: No module named 'data_management'

Here is a screenshots:

Can someone help, what I am doing wrong or how can I fix it?

EDIT (Put folders):

/Users/Armut/Desktop/High_D/Coursera/bin/python /Users/Armut/Desktop/High_D/main.py
WARNING:root:Failed to import geometry msgs in rigid_transformations.py.
WARNING:root:Failed to import ros dependencies in rigid_transforms.py
WARNING:root:autolab_core not installed as catkin package, RigidTransform ros methods will be unavailable
Traceback (most recent call last):
  File "/Users/Armut/Desktop/High_D/main.py", line 7, in <module>
    from visualization.visualize_frame import VisualizationPlot
ModuleNotFoundError: No module named 'visualization.visualize_frame'

EDIT:

/Users/Armut/Desktop/High_D/Coursera/bin/python /Users/Armut/Desktop/High_D/src/main.py
Traceback (most recent call last):
  File "/Users/Armut/Desktop/High_D/src/main.py", line 7, in <module>
    from src.visualization.visualize_frame import VisualizationPlot
  File "/Users/Armut/Desktop/High_D/src/visualization/visualize_frame.py", line 10, in <module>
    from utils.plot_utils import DiscreteSlider
ModuleNotFoundError: No module named 'utils.plot_utils'

Edit (No errors, but I just get a blank picture):

Edit (I installed matplotlib 3.0.3 and got this): The issue here is, that it is just a picture. If you can see there are buttons like "next". I should be able to click it so I can track it. But how does it work?

Answer 1

Do the following

from read_csv import *
import visualize_frame as vf

The reason why it was not working for you is because you were importing files that dont exist on your system. When you do from data_management.read_csv import *, what you are telling the Python interpreter to do is to search for a folder called data_management inside you're Coursera folder and get everything from read_csv.py.

This is the same case with visualize_frame. Since you have a flat directory structure, you dont need the folder names. You can directly import the .py files as is.

Another thing to note here is that I personally wouldn't do from read_csv import * because I will be flooding my namespace with a lot of things I probably wont use. I would rather use import read_csv as any_alias_you_like. This way I only fill my namespace with what I want by doing the following

x = any_alias_you_like.function_call()

The reason why I didn't do this with the main code solution is because I am not sure where all you are using read_csv functions and classes in your code and if that is not accounted for by prefxing the alias name properly, you will run into a multiple errors. So my advice is to identify all the funcutions/classes that you are using in read_csv.py and prefix them properly with an alias.

I also used the import statement for the visualize_frame differently. This is because, when you do a from import..., you are only partially initializing the module. However, a proper import visualize_frame will ensure that your entire module is initialized in one call and you can use everything it offers by simply prefixing the alias.

Read about the difference between from import and import... here.

Read about how Python searches for libraries here.