[英]How to prevent entering negative numbers in Kivymd MDTextField
In MDTextField, there is a restriction on entering only numbers, this is input_filter: "float", "int".在MDTextField中,有一个只能输入数字的限制,这个是input_filter: "float", "int"。 But you can enter negative numbers但是你可以输入负数
MDTextField:
id: z1_m
text:""
hint_text: "z1"
helper_text: "Число зубьев шестерни"
helper_text_mode: "on_focus"
input_filter: "float"
on_text_validate: app.prochnjst()
Expected that when the user enters a minus sign, nothing happens预期当用户输入减号时,什么也不会发生
You can use try/ except:你可以使用 try/ 除了:
try:
x = int(input())
assert x > 0
except AssertionError :
print("Only positives are allowed")
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.