I want to know how can I make An Entry Accept Decimal Numbers ONLY

python tkinter programming

CodePudding user response：

You can use isdecimal() function to check if its decimal or not. https://www.geeksforgeeks.org/python-string-isdecimal-method/#:~:text=Python String isdecimal() function,decimal, else it returns False.

CodePudding user response：

Here's an example of basic input validation on an Entry widget

import tkinter as tk
from tkinter import ttk


class App(tk.Tk):
    def __init__(self):
        super().__init__()
        # register a validation function using the '%P' substitution code
        self.vcmd = (self.register(self.validate), '%P')
        self.entry = ttk.Entry(  # this is the entry you want to validate
            self,
            validate='key',  # trigger validation on a keypress
            validatecommand=self.vcmd  # set registration
       )
       self.entry.pack()

    def validate(self, P):  # P is the text being entered at the time of callback
        # this function should return True if the input is valid, or False otherwise
        return P.isdecimal() or P == ''  # include "or P == ''" to allow empty values


if __name__ == '__main__':
    app = App()
    app.mainloop()  # run the app

There's a lot more information about this available here. I recommend reading through that tutorial.