Output 的交互式 python 到 shell 变量

Question

There is an interactive python script something like

def myfunc():
    print("enter value between 1 to 10")
    i=int(input())
    if(i<1 or i>10):
        print("again")
        myfunc()
    else:
        print(i)

I want to store the final output which is print(i) in a shell variable. Something like

python myFile.py | read a

Above query get stuck everytime i run the command. Is it possible to do that? Even though ( read b | python myFile.py ) | read a ( read b | python myFile.py ) | read a defeats the purpose of interactive python function but this doesn't work as well. It works if myfunc() is non-interactive(not expecting user input). The function in reality takes some input, manipulates it, and then output the result in required format. I know it would be much easier to use either python or shell, but since i already wrote the python function, was wondering if it is possible to link both. If yes, is it also possible to add only final value to shell variable rather than all the print()

Same issue happens(terminal gets stuck) when i do

python myFile.py > someFilename

However file someFilename was created even though terminal was unresponsive. It seems shell is starting both the processes at the same time which makes sense. I am guessing if somehow python myfile.py executes independently before opening the pipe it could be possible, but i may be wrong.

Answer 1

If you are working on Linux or other Unix variants, would you please try:

import os
def myfunc():
    tty = os.open("/dev/tty", os.O_WRONLY)
    os.write(tty, "enter value between 1 to 10\n")
    i=int(input())
    if(i<1 or i>10):
        os.write(tty, "again\n")
        myfunc()
    else:
        print(i)

BTW if your shell is bash , it will be better to say:

read a < <(python myFile.py)

Otherwise read a is invoked in the subshell and the variable a cannot be referred in the following codes.