'Can't open file 'demo.py': [Errno 2] No such file or directory when running through a bash script

I have a folder named test-folder with two files.

# file name: demo.py
print('hello world')

# file name: script.sh
python3.7 demo.py

The test-folder is present inside /home/username/Documents/

I have exported the above path to the .bashrc.

Now when I try to execute the script.sh using the following command,

bash script.sh

I get the following error

python3.7: can't open file 'demo.py': [Errno 2] No such file or directory

How can I solve this? I'm on Ubuntu 18.04

pythonpython-3.xbashshell


Solution 1:[1]

Move to the folder containing the file : $ cd /home/username/Documents/test-folder

after making sure you are in the folder ccontaining the file try:

$ python file_name.py

if it doesn't work try the full path to python and the full path to the file like this:

$ /usr/lib/python3.7 /home/username/Documents/test-folder/file_name.py

Solution 2:[2]

If you want to use script.sh from anywhere, your approach won't work. When executing $ bash script.sh, the file script.sh is expected to be located in the working directory.

You can use absolute paths to solve this:

# filename: script.sh

python3.7  /home/username/Documents/test-folder/demo.py

Try executing this with bash /home/username/Documents/test-folder/script.py.

You can achieve your goal in an arguably simpler way by adding /home/username/Documents/test-folder to your PATH, adding a shebang to demo.py and making demo.sh executable.

$ export PATH=/home/username/Documents/test-folder:$PATH
$ chmod +x /home/username/Documents/test-folder/demo.py

demo.sh will look like this with a shebang:

#!/usr/lib/python3.7

print('hello world')

and can be executed from anywhere with $ demo.sh.

Solution 3:[3]

It works for me. Is there anything about your setup that is different than mine?

$ cat demo.py 
print("Hello World")

$ cat script.sh 
python3.7 demo.py

$ tree
.
??? test-folder
    ??? demo.py
    ??? script.sh

1 directory, 2 files

$ cd test-folder/
$ bash script.sh 
Hello World

Edit: Try the following.

$ cat script.sh
python3.7 "`dirname "$0"`/demo.py"

Solution 4:[4]

If your script.sh file is only there to run the Python script, it’s not needed. Instead make the Python script itself executable.

(1) add this as the first line in your Python file — this tells Unix which interpreter to use when running this file:

#!/usr/bin/env python37

(2) make your Python file executable so it can be run directly:

chmod +x demo.py

(3) put that file on the path, e.g. a path you set via a Bash config file, or one that’s already on the path like /usr/local/bin.

Now any time you give the command demo.py your script will run. Note the .py extension isn’t required — you can name the file anything you like.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Yehdhih ANNA
Solution 2 gutjuri
Solution 3
Solution 4 Chris Johnson

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