Python命令行环境中如何获取多用户输入以实现端口扫描功能

你此前出现语法错误的核心原因是使用了错误的行尾反斜杠：反斜杠仅用于将单行逻辑代码拆分为多行物理行输入，单独的赋值语句本身是完整逻辑行，末尾加反斜杠会导致解释器将下一行内容和当前行拼接，进而触发语法错误。以下是两种可行的实现方案：

方案1：直接在Python交互式REPL逐行输入 #

无需添加任何特殊符号，逐行输入代码即可，循环部分输入时注意保持缩进，全部代码输入完成后按两次回车触发执行：

# 先执行python/python3命令进入REPL环境后输入以下内容
from socket import *

ip = input("Submit IP to scan:")
start = input("Submit starting port:")
end = input("Submit ending port:")
print("Scanning IP:", ip)
for port in range(int(start),int(end)):
    print("Scanning port:" + str(port) + "..")
    var_socket = socket(AF_INET,SOCK_STREAM)
    var_socket.settimeout(3)
    if var_socket.connect_ex((ip,port)) == 0:
        print("port", port, "is open")
    else:
        print("err code:", var_socket.connect_ex((ip,port)))
    var_socket.close()
print("Scanning completed!")

方案2：直接通过shell命令行传递代码执行 #

不需要进入REPL，直接在终端中一次性执行全部代码：

• Windows PowerShell环境：

@'
from socket import *
ip = input("Submit IP to scan:")
start = input("Submit starting port:")
end = input("Submit ending port:")
print("Scanning IP:", ip)
for port in range(int(start),int(end)):
    print("Scanning port:" + str(port) + "..")
    var_socket = socket(AF_INET,SOCK_STREAM)
    var_socket.settimeout(3)
    if var_socket.connect_ex((ip,port)) == 0:
        print("port", port, "is open")
    else:
        print("err code:", var_socket.connect_ex((ip,port)))
    var_socket.close()
print("Scanning completed!")
'@ | python

• Windows CMD环境：

python -c "from socket import *;ip=input('Submit IP to scan:');start=input('Submit starting port:');end=input('Submit ending port:');print('Scanning IP:', ip);for port in range(int(start),int(end)):print('Scanning port:' + str(port) + '..');var_socket = socket(AF_INET,SOCK_STREAM);var_socket.settimeout(3);if var_socket.connect_ex((ip,port)) == 0:print('port', port, 'is open');else:print('err code:', var_socket.connect_ex((ip,port)));var_socket.close();print('Scanning completed!')"

内容的提问来源于stack exchange，提问作者Brakke Baviaan