Error in Importing a bash script into a python [duplicate]

Question

I am trying to create a python script script.py in bash and importing a bash script.

#!/usr/bin/env python    
import os
import glob
from fnmatch import fnmatch
# importing a software
python_package = os.system("""#!/path_to_bin/bin/python \
from __future__ import print_function, division \
from python_toolbox.toolbox.some_toolbox import run \
if __name__ == '__main__': \
    run()"""

# testing 
greeting = "Hello world!"
print(greeting)

Running the script.py in python3

$python3 script.py
  File "script.py", line 15
    greeting = "Hello world!"
SyntaxError: invalid syntax

Um... os.system(... has no closing paren. It's best to read your own code before asking others to read it for you. — Gene
– Gene, Commented Nov 8, 2022 at 3:09
You are missing a paren at the end of your os.system(... call. Python figured that out on the next line. — tdelaney
– tdelaney, Commented Nov 8, 2022 at 3:10

tdelaney · Accepted Answer · 2022-11-08 04:14:16Z

1

Nominally the problem is that you are missing the closing paren on the os.system call. But there is a better way to run a python program than trying to write it all on the command line. Instead, you can pass a full script, including newlines, to python's stdin.

#!/usr/bin/env python    
import sys
import subprocess as subp

# importing a software
def run_script():
    subp.run([sys.executable, "-"], input=b"""
print("I am a called python script")
""")

# testing
run_script() 
greeting = "Hello world!"
print(greeting)

In this script, the second python script is run whenever you call run_script. Notice that the script in the string has to follow the normal python indendation rules. So, there is indentation inside run_script but then the string holding the second script starts its indentation all the way to the left again.

edited Nov 8, 2022 at 4:14

answered Nov 8, 2022 at 3:19

tdelaney

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2 Comments

Sher Over a year ago

Thank you very much @tdelaney. How do I call the software later in the code? I assigned the software into a variable like this: variable = subp.run([sys.executable, "-"], input=b""" print("I am a called python script") """). But seems doesn't work.

tdelaney Over a year ago

That ran the script and saved run 's return value to variable. Instead you could write a function. I updated the example to do that.

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