Unable to call python function using shell script

Question

I am using one shell script to call python function -

python -c 'import create_table; create_table.createTable()'

This script is in "scripts" directory and create_table.py file is in another directory - "cdk" Folder structure will look like this -

infra -> cdk -> create_table.py
      -> scripts -> run-script.sh

cdk and scripts directories are at same level inside infra directory.

When I am trying to run my script it is giving below error -

ModuleNotFoundError: No module named 'create_table'

I tried placing create_table.py file in scripts directory, but still it's giving same error. I am referring this question - Calling a Python function from a shell script Can anyone please help me out? Am I missing something here?

Update - create_table.py code

import boto3

def createTable():
    print("createTable function")

There is no class in this python file.

k.avinash · Answer 1 · 2019-11-19T08:43:03.437

0

Your script and package are in different directories. You need to add __init__.py to your cdk. This will tell python it's a module. Then run python -c 'import ..cdk.create_table; create_table.createTable()

edited Nov 19 '19 at 08:43

answered Nov 19 '19 at 07:43

k.avinash

81
7

Do I need to add anything in __init__.py file? And do I need to add two dots before cdk.create_table – Nitesh Nov 19 '19 at 08:48
`__init.py__` is a empty file indicating directory will acts as module. You have to give relative or absolute path. Add .. while importing indicates it has to get out from scripts and go to cdk – k.avinash Nov 20 '19 at 09:17

Ahmed Abdelazim · Answer 2 · 2019-11-19T09:07:55.833

0

Import the module in a correct way

also use createTable() directly NOT create_table.createTable()

python -c 'import sys; sys.path.insert(0, "../cdk"); from create_table import createTable; createTable()'

edited Nov 19 '19 at 09:07

answered Nov 19 '19 at 08:03

Ahmed Abdelazim

717
7
14

There is no class in create_table.py file. So "from create_table import createTable; " will not work – Nitesh Nov 19 '19 at 08:52
@Nitesh You call the function. you did not import the whole file. I tested on my shell and `create_table.createTable()` gave an error while `createTable()` did not – Ahmed Abdelazim Nov 19 '19 at 09:02
I have added this line in my script - python -c 'import sys; sys.path.insert(0, "infra/cdk"); from create_table import createTable; createTable()' and it is giving this error - ModuleNotFoundError: No module named 'create_table' – Nitesh Nov 19 '19 at 09:07
Thanks for updating absolute path. I will try it and will let you know. – Nitesh Nov 19 '19 at 09:10
see the edit `python -c 'import sys; sys.path.insert(0, "../cdk"); from create_table import createTable; createTable()'` – Ahmed Abdelazim Nov 19 '19 at 09:10
I have updated my script as per your suggestion but still it is giving same error - ModuleNotFoundError: No module named 'create_table' – Nitesh Nov 19 '19 at 09:35
You said that it is working at your end. Could you please share your code. – Nitesh Nov 19 '19 at 09:46
Ok. please wait – Ahmed Abdelazim Nov 19 '19 at 10:24
this is directory structure https://i.stack.imgur.com/fFahe.png – Ahmed Abdelazim Nov 19 '19 at 10:48
`cat infra/scripts/run-script.sh` `python -c 'import sys; sys.path.insert(0, "../cdk"); from create_table import createTable; createTable()'` – Ahmed Abdelazim Nov 19 '19 at 10:53
`cat infra/cdk/create_table.py` `def createTable(): print("Hello World")` – Ahmed Abdelazim Nov 19 '19 at 10:54
`~/infra/scripts$ bash run-script.sh` returns Hello world – Ahmed Abdelazim Nov 19 '19 at 10:55
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/202692/discussion-between-nitesh-and-ahmed-abdelazim). – Nitesh Nov 20 '19 at 05:30

score 0 · Answer 3 · answered Nov 19 '19 at 10:42

Most likely you're running into problems because imports depend on the path from which you're calling the run-script.sh. A solution to this might be adding:

if __name__ == "__main__":
    createTable()

at the end of create_table.py and replacing the content of run-script.sh with:

#!/bin/bash
pth=`dirname $0`
python3 $pth/../cdk/create_table.py

After doing so you should be able run it from any path you want/need to.

Unable to call python function using shell script

3 Answers3