[英]Validating Tkinter Entry Box
I am trying to validate my entry box, that only accepts floats, digits, and operators (+×÷-, % ).我正在尝试验证我的输入框,它只接受浮点数、数字和运算符 (+×÷-, % )。 But my program only accepts numbers not symbols.
但是我的程序只接受数字而不是符号。
I think it is a problem with my conditions or Python Regex.我认为这是我的条件或 Python Regex 的问题。
Here's the code:这是代码:
from tkinter import *
import re
root = Tk()
def correct(inp):
pattern = re.compile(r'^(\d*\.?\d*)$')
if pattern.match(inp) is not None:
return True
elif inp is "":
return True
else:
return False
a = Entry(root)
e = root.register(correct)
a.config(validate='key', validatecommand=(e, '%P'))
a.pack()
root.mainloop()
Your regexp only matches floats: \\d*.?\\d* matches digits followed optionally by a dot and more digits.您的正则表达式仅匹配浮点数: \\d*.?\\d* 匹配数字后跟可选的点和更多数字。 If what you want to match is a pattern like [float][operator][float], then you can use (just add the operators you want in the square brackets):
如果您要匹配的是像 [float][operator][float] 这样的模式,那么您可以使用(只需在方括号中添加您想要的运算符):
pattern = re.compile(r'^\d*\.?\d*[+*/\-%]?\d*\.?\d*$')
If you don't care about the order and just want to allow any sequence of numbers and operators:如果您不关心顺序而只想允许任何数字和运算符序列:
pattern = re.compile(r'^[\d.+*/\-%]*$')
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