用户在我的输入提示上按下回车后，我如何重复要求输入

Question

您好，我在保持我的应用程序打开、重复我的输入功能以及从用户本身获取输入方面遇到了问题。这是我的代码

import socket
import time
import sys

HOSTNAME = socket.gethostname()
CREDITS = "Developed by SnoDev"

print("Welcome " + HOSTNAME + "!")
time.sleep(1)
def cmd():
   input("Command Bar: ")
cmd()

我想从函数 cmd() 获取输入，但我不知道该怎么做，有人可以帮忙吗？

Answer 1

使用递归，想断就断

import socket
import time
import sys

HOSTNAME = socket.gethostname()
CREDITS = "Developed by SnoDev"

print("Welcome " + HOSTNAME + "!")
time.sleep(1)

def do_something_with_input(res):
   pass

def cmd():
   res = input("Command Bar: ")

   do_something_with_input(res)
   
   return cmd()

cmd()

Answer 2

这是东西。我添加了一些命令，例如 DIR 或 ping。另外，递归不好。 while循环更好。

import socket
import time
import os
import platform    # For getting the operating system name
import subprocess  # For executing a shell command

def ping(host,num="4"):
    """
    Returns True if host (str) responds to a ping request.
    Remember that a host may not respond to a ping (ICMP) request even if the host name is valid.
    """

    # Option for the number of packets as a function of
    param = '-n' if platform.system().lower()=='windows' else '-c'

    # Building the command. Ex: "ping -c 1 google.com"
    command = ['ping', param, num, host]

    return subprocess.call(command) == 0

HOSTNAME = socket.gethostname()
CREDITS = "Developed by SnoDev"

print("Welcome " + HOSTNAME + "!")
time.sleep(1)
while True:
    var1=input("Command Bar: ")
    if "ping" in var1.lower():
        var2=var1.lower().split()
        
        if len(var2)==1:
            print("Usage: ping [-number]\n\nOptions:\n\t-number\t\tPing the host for specified number of times.\n")
        elif len(var2)==3:
            print(ping(var2[1],var2[2][1:]))
            #print(ping(var2[1],var2[2]))
        else:
            print(ping(var2[1]))
        
    elif var1.lower()=="exit":
        break
    elif "dir" in var1.lower():
        var3=var1.lower().split()
        if len(var3)==1:
            print("Usage: DIR [-path]\n\nOptions:\n\t-path\t\tList all folders and files inside the specified directory.\n")
        else:
            x=os.listdir(var3[1])
            print("\nDirectories and files found: \n")

            for i in x:
                print(i)
            print("\n")
        
    elif var1=="":
        pass
    
    else:
        print(f"Error: {var1} is not recognized as a command.\n")

用户在我的输入提示上按下回车后，我如何重复要求输入

How do i repeat asking for input after my user pressed enter on my input prompt

python

pycharm