如果用户在 Python/Tkinter 中输入字符串，如何告诉用户只使用整数? [英] How to tell user to only use integers if they input string in Python / Tkinter?

问题描述

给出错误并告诉用户仅在输入字母作为输入时输入数字的最佳方法是什么?不起作用的代码:

What would be the best way to give an error and tell the user to only input numbers if they type letters as an input? Code that doesn't work:

if self.localid_entry.get() == int(self.localid_entry.get():
                self.answer_label['text'] = "Use numbers only for I.D."

该变量在 Tkinter 中获得:

The variable is obtained in Tkinter with:

    self.localid2_entry = ttk.Entry(self, width=5)
    self.localid2_entry.grid(column=3, row=2)

推荐答案

是这样的:

try:
    i = int(self.localid_entry.get())

except ValueError:
    #Handle the exception
    print 'Please enter an integer'

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