IP地址的Tkinter条目验证

Question

我将IPv4地址作为用户的输入，使用Tkinter条目，我更希望使用widget的validatecommand属性，该属性只允许使用格式的条目三十、 XXX.XXX公司.XXX，X位数。在

这个问题可以通过使用表达式^\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}$匹配条目来解决，但我想事先这样做。在

我尝试使用IP地址模块如下：

import tkinter as tk
import ipaddress as ip
import re

def validate(value):
    if ip.ip_address(value):
        return True
    return False

window = tk.Tk()

tk.Label(window, text = "IP", font = 'Arial 10 bold').grid(row = 0, column = 0, padx = 5, pady = 5, sticky = 'ew')
varip = tk.StringVar()
vcmd = window.register(validate)
ipadd = tk.Entry(window, textvariable = varip, width = 23, validate = 'key', validatecommand = (vcmd, '%P'))
ipadd.grid(row = 0, column = 1, padx = 5, pady = 5)
window.mainloop()

问题是，只有引入的第一个字符才被检查为IPv4地址，并且允许所有字符，而不仅仅是数字和点。在

怎么能做到呢？在

Answer 1

如果在验证Ipv4时遇到问题，可以在代码中添加以下逻辑。我有一个类似的tkinter程序，需要Ipv4验证。这对我有用。在

import re 

# Make a regular expression 
# for validating an Ip-address 
regex = '''^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)'''

# Define a function for 
# validate an Ip addess 
def check(Ip):  

    # pass the regular expression 
    # and the string in search() method 
    if(re.search(regex, Ip)):  
        print("Valid Ip address")  

    else:  
        print("Invalid Ip address")  


# Driver Code  
if __name__ == '__main__' :  

    # Enter the Ip address 
    Ip = "192.168.0.1"

    # calling run function  
    check(Ip) 

    Ip = "110.234.52.124"
    check(Ip) 

    Ip = "366.1.2.2"
    check(Ip) 

Answer 2

我已设法解决了以下问题：

import tkinter as tk

def validate(P, S):
    if S.isdigit():
        if 0 <= len(str(P)) <= 3:
            return True
    return False

window = tk.Tk()

tk.Label(window, text = "IP", font = 'Arial 10 bold').grid(row = 0, column = 0, padx = 5, pady = 5, sticky = 'ew')
varip = tk.StringVar()
vcmd = window.register(validate)
ipadd = tk.Entry(window, textvariable = varip, width = 23, validate = 'key', validatecommand = (vcmd, '%P', '%S'))
ipadd.grid(row = 0, column = 1, padx = 5, pady = 5)
window.mainloop()