def check_Driver(FName_Entry, LName_Entry, day_combobox, month_combobox, year_combobox,
myvar1, Email_Entry, Phone_Entry, event=None):
FName = FName_Entry.get()
LName = LName_Entry.get()
Email = Email_Entry.get()
Number = Phone_Entry.get()
day = day_combobox.get()
month = month_combobox.get()
year = year_combobox.get()
length = len(Number)
if not FName.isalpha() and len(FName) != 0:
errormsg = Message(root, text='Enter a valid first name', anchor=CENTER,
bg="red", width=1000)
canvas.create_window(1020, 134, anchor=NW, window=errormsg)
# messagebox.showerror('Only letters', 'Only letters are allowed!')
if not LName.isalpha() and len(LName) != 0:
errormsg2 = Message(root, text='Enter a valid last name', anchor=CENTER,
bg="red", width=1000)
canvas.create_window(1020, 174, anchor=NW, window=errormsg2)
if not Number.isdigit() or length != 11 and length != 0:
errormsg5 = Message(root, text='Enter a valid phone number', anchor=CENTER,
bg="red", width=1000)
canvas.create_window(1020, 334, anchor=NW, window=errormsg5)
if not FName or LName or Email or Number or day or month or year:
error_blank = Message(root, text="Please don't leave any field/s blank",
anchor=CENTER, bg="red", width=1000)
canvas.create_window(600, 450, anchor=NW, window=error_blank)
if int(myvar1.get()) not in (1, 2, 3):
error_blank2 = Message(root, text="Please don't leave any field/s blank",
anchor=CENTER, bg="red", width=1000)
canvas.create_window(600, 450, anchor=NW, window=error_blank2)
if (FName.isalpha() and LName.isalpha() and Number.isdigit() and length == 11
and myvar1.get() in [1,2,3] and len(Email) != 0 and len(day) != 0
and len(month) != 0 and len(year) != 0):
根据该代码；请不要将任何字段留空"；如果FName、LName、Email、Number、day、month或year为空，则应该生成，但当我完全填写表单时，它仍然会生成此消息，我无法继续前进。
是什么原因造成的？
if not FName or LName or Email or Number or day or month or year:
这需要在每个变量之前单独设置一个not。现在，它被解释为
if (not FName) or (LName) or (Email) . . .
因此，如果LName、Email或其他任何一个为真，则整个条件将为，并显示错误。
你也可以否定all条件，而不是单独否定每一个条件，这可能会稍微干净一点：
if not all([FName, LName, Email, Number, day, month, year]):
这读起来也不错。