将变量从一个 shell 传递到另一个 shell 以执行 python 脚本

Question

I have a python script that takes an argument and return a multiplication. I have this shell script pythoncall.sh: python /user/mult.py var1

I want to run this for different argument values in a loop: second.sh

for i in 1 2 3
  do 
  var1=$i
  ./pythoncall.sh
done

but i don't get the result because i don't pass the variable i think. my error is IndexError: list index out of range.

the python script:

import sys
def main(argv):

    num1=sys.argv[1]
    len1=int(num1)*3
    print(len1)

if __name__ == '__main__':
    main(sys.argv)

Answer 1

So, the direct answer is you need to export the variable for the second shell script to be able to see it:

export var1=$i

but why do you need the variable and second shell script at all? Why not just call the python script directly:

for i in 1 2 3
do
  python /user/mult.py $i
done