如何在python3.7中修复“ SyntaxError：无效语法”？

Question

我创建了这个python脚本：

#!/usr/bin/python
#-*- coding: utf-8 -*-

import socket
connexion = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = input("Ip :")
port = int(input("Port :"))
connexion.connect(host, port)
print("Connection ok with {} from the {} port.".format(host, port))
started = True

while started:
    choice = int(input("[1] Send command\n [2] Leave\n > "))
    if choice == 1:
        command = input(" Command : ")
        connexion.send(command.encode())
        retour = connexion.recv(1024).decode('latin1')
        print(retour)

    if choice == 2:
        connexion.send("exit")
        connexion.close()
        break

但是，如果我尝试运行它，则会出现此错误：

Ip :127.0.0.1
Traceback (most recent call last):
  File "./test.py", line 6, in <module>
    host = input("Ip :")
  File "<string>", line 1
    127.0.0.1
          ^
SyntaxError: invalid syntax

我不知道错误在哪里...而且我使用python 3.7来做到这一点。

你能告诉我错误在哪里吗？