How to execute multiline python code from a bash script?

Question

I need to extend a shell script (bash). As I am much more familiar with python I want to do this by writing some lines of python code which depends on variables from the shell script. Adding an extra python file is not an option.

result=`python -c "import stuff; print('all $code in one very long line')"`

is not very readable.

I would prefer to specify my python code as a multiline string and then execute it.

Asked By: cknoll

||

Source

Answer 1

Use a here-doc:

result=$(python <<EOF
import stuff
print('all $code in one very long line')
EOF
)

Answered By: Barmar

Answer 2

Tanks to this SO answer I found the answer myself:

#!/bin/bash

# some bash code
END_VALUE=10

PYTHON_CODE=$(cat <<END
# python code starts here
import math

for i in range($END_VALUE):
    print(i, math.sqrt(i))

# python code ends here
END
)

# use the 
res="$(python3 -c "$PYTHON_CODE")"

# continue with bash code
echo "$res"

Answered By: cknoll

Answer 3

This solution might be complex, but working my ubuntu

one line of python script can

import yaml and sys lib
lambda-function read yaml file by using first sys.argv1
get expected value from return nested-dictionary from lambda function by using sys.argv2 sys.argv3
print yaml_as_dict will load test_var as variable
check test_var by echo $test_var

$
$ test_var=$(python3 -c $"import yaml,sys; yaml_as_dict=(lambda :yaml.safe_load(open(f'{sys.argv[1]}','r').read()))()[sys.argv[2]][sys.argv[3]]; print(yaml_as_dict)" <argv1> <argv2> <argv3>)
$
$ echo $test_var
$

How can I put multiple statements in one line?

How can I write multi-line code in the Terminal use python?

How to define a bash variable from python EOF

Answered By: P_M

How to execute multiline python code from a bash script?

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