def pupiluserpass():
global usernames, passwords
usernameinp = pupiluserinputbox.get()
passwordinp = pupilpasswordinputbox.get()
为什么会出现错误:未定义
NameError: global name 'pupiluserinputbox'
?输入框在另一个过程中:
def pupillogin():
ruapupil = Label(app, text = "If you're a pupil log in here:")
ruapupil.grid(row = 1, columnspan = 3, sticky = W)
pupilusername = Label(app, text = "Please enter your Username:")
pupilusername.grid(row = 2, column = 0, sticky = W)
pupiluserinputbox = Entry(app, width = 10)
pupiluserinputbox.grid(row = 2, column = 1, sticky = W)
pupilpassword = Label(app, text = "Please enter your Password:")
pupilpassword.grid(row = 3, column = 0, sticky = W)
pupilpasswordinputbox = Entry(app, width = 10)
pupilpasswordinputbox.grid(row = 3, column = 1, sticky = W)
pupilenter = Button(app, text = "Enter!", command = pupiluserpass)
pupilenter.config(height = 1, width = 8)
pupilenter.grid(row = 4, column = 1, sticky = W)
我怎样才能使这项工作成功完成,而没有获得
NameError
? 最佳答案
对于class
,您应该将带有那些错误属性的变量设置为self
,即该对象的当前实例。这是在class
内其他方法中访问这些变量的实际方法。例如:
def pupiluserpass():
...
usernameinp = self.pupiluserinbox.get()
passwordinp = self.pupilpasswordinputbox.get()
def pupillogin():
...
self.pupiluserinputbox = Entry(app, width = 10)
self.pupiluserinputbox.grid(row = 2, column = 1, sticky = W)
...
self.pupilpasswordinputbox = Entry(app, width = 10)
self.pupilpasswordinputbox.grid(row = 3, column = 1, sticky = W)
您也可以在这里做很多
global
声明,但是最好使用self
。关于python - 为什么会收到错误:“NameError:未定义全局名称'pupiluserinputbox'”,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/22355401/