how to control with other interactive applications

interact_with_python.py

import pexpect
import re

def interact_with_repl():
    child = pexpect.spawn('python3')
    
    child.expect(['>>> '])

    expect_ret = '>>> '
    while True:
        command = input(expect_ret)
        if command.lower() == 'exit':
            child.sendline('exit()')
            break
        command = command.replace('\t', '    ')
        #print('['+command+']')
        child.sendline(command)
        except_list = ['>>> ', 
                       '... '
                      ]
        expect_ret = except_list[child.expect(list(map(re.escape, except_list)))]
        before = child.before.decode('utf-8')
        #print('{'+repr(before)+'}')
        print(before[len(command+'\r\n'):], end='')

    child.close()

interact_with_repl()