Run Python app once & give it input from a text file line-by-line in Bash-CodePudding

I have a simple Python app that takes two inputs in separate lines and prints a result...

def f(n, x):
    if n == 0:
        return 0
    # print string n times
    print(n*x)

# number
n = int(input())
# string
x = input()
print(f(n, x))

Want to give inputs to the Python app from a .txt file and store the compiled outputs in another file (output.txt), the inputs.txt file contains these inputs:

3
a
4
b
5
c
⋮
0

The app should run once and then take each line as input...
How can I do that in Bash?
The output.txt should be like this:

aaa
bbbb
ccccc

P.S
I tried the below script but that was a disaster as the Python app runs again and only takes the first input!

while IFS= read -r line || [[ -n "$line" ]]; do
    python3 main.py | "$line"
done < inputs.txt >> output.txt

CodePudding user response：

Your Python script already iterates over its input line-by-line. You don't need to do much of anything in bash except provide the file to Python.

python3 main.py < inputs.txt > output.txt

CodePudding user response：

If you want to feed the values from Bash to Python, your python script needs to receive both the number and the character. Have you tried reading lines 2 by 2 in your Bash loop?

while read -r nbChar; read -r theChar [...]