Python from command line
Problem
You want to calculate something with Python quickly, from the command line. You might even want to use Python in a bash script to produce some result.
Solution
$ python -c "print(2*3)" 6
Storing the result in a variable:
$ X=`python -c "print(2*3)"` $ echo $X 6
Thanks to Tajti A. for the tip.
Update (20170803)
You can also pass a bash variable to the embedded Python:
VAL="cat dog cat"
NEW=`python3 -c "print('$VAL'.replace('dog', 'wolf'))"`
echo $NEW
Output: “cat wolf cat”.
Categories: python
bash, python -c, python in shell, shell
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