shell script execute python code as shell script

Question

I would like to execute hello.py using test.sh. However, it seems test.sh read hello.py as sh file.

error message

line 1: syntax error near unexpected token `'hello''

test.sh

#!/user/bin/ python (which python path)
ARRAY=(1 2 3 4)
for num in ${ARRAY[@]}; do
 /artic/m-yasunaga/work/korin-3/src/example/hi.py
 echo $num"th loop"
done

hello.py

print('hello')

When I changed print('hello') to echo hello, it worked perfectly.

How can I execute hello.py as python code? ( I use linux )

• Gordon Davisson: Your python script needs a shebang line (see this question). Also, your shell script should have a shell shebang, not one referring to python (and it cannot contain parenthetical remarks, nor spaces in the middle of the path). The shebang line that starts a script indicates how to run that script, not others it may run. The file extension (like .sh or .py) is ignored when you run a script directly like this.
• Gordon Davisson: Actually, since your shell script uses an array (which is a bash extension, not available in all other shells), you should use a bash shebang (like #!/bin/bash or #!/usr/bin/env bash), not a generic shell shebang (like #!/bin/sh).
• William Pursell: /user/bin/ python? That's ... bizarre. Try /usr/bin/python.
• user1934428: @JennyRowland : Adding to the comment given by Pursell, your Script is Shell, not Python. Trying to construct a #!-line for Python is even more bizarre....

Answer 1

You have some syntax errors etc in your scripts.....try this:

Create the following two scripts.

Name: test.sh

#!/usr/bin/env bash
ARRAY=(1 2 3 4)
for num in ${ARRAY[@]}; do
 ./hello.py
 echo $num"th loop"
done

Name: hello.py

#!/usr/bin/env python
print('hello')

From your command line, run the following

chmod 700 test.sh ; chmod 700 hello.py

Now from the command line, you can run:

./test.sh

The output will be:

>./test.sh 
hello
1th loop
hello
2th loop
hello
3th loop
hello
4th loop

• Gordon Davisson: It doesn't matter much here, but I'd also recommend double-quoting the variable references (for num in "${ARRAY[@]}"; do and echo "${num}th loop").

Answer 2

You should mention the python path

#!/user/bin/ python (which python path)

in hello.py file and make it executable using

chmod +x hello.py

Now you can use it as a executable.