如何将整数转换为字符串，并从该字符串中选择特定字符？

Question

我正在尝试制作一个模拟按键的程序，每5秒钟按一次数字，这样就可以进行5 10 15 20等等，但是我得到了很多乱七八糟的东西，我不理解为一种形式错误，这是代码：

from time import sleep
import pynput
from pynput.keyboard import Key, Controller, Listener
keyboard = Controller()
i = 1
while not i == 2:
    print(i)
    sleep(1)
    i += 1
e = 0
f = 1
g = 1
while f == 1:
    e += 5
    q = len(str(e))
    c = str(e)
    while g < q+1:
        keyboard.press(c[g:g])
        keyboard.release(c[g:g])
        g += 1
        sleep(5)

这是错误：

 Traceback (most recent call last):
      File "E:\Python programs\clicker.py", line 18, in <module>
        keyboard.press(c[g:g])
      File "C:\Users\Loput\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pynput\keyboard\_base.py", line 384, in press
        resolved = self._resolve(key)
      File "C:\Users\Loput\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pynput\keyboard\_base.py", line 577, in _resolve
        raise ValueError(key)
    ValueError