Question

我想比较e1_var和e2_var中存储的两个值。如果它们是相同的，我想在主窗口上显示一个按钮;如果他们不匹配，我想显示另一个按钮。到目前为止我所尝试的并不起作用。有人可以告诉我该怎么做吗？

def lockscreen():
    locks = Toplevel(width=500,height=500)
    locks.title('Lock Screen')
    l1 = Label(locks,text="Enter 4 Digit Lock Code")
    l1.grid(row=1,column=1,columnspan=3)
    e1=Entry(locks, bd=5)
    e1.grid(row=2,column=1,columnspan=3)
    e1_var=StringVar()
    e1["textvariable"]=e1_var

    def insert_1():
        e1.insert(INSERT,1)
    def insert_2():
        e1.insert(INSERT,2)
    def insert_3():
        e1.insert(INSERT,3)
    def insert_4():
        e1.insert(INSERT,4)
    def insert_5():
        e1.insert(INSERT,5)
    def insert_6():
        e1.insert(INSERT,6)
    def insert_7():
        e1.insert(INSERT,7)
    def insert_8():
        e1.insert(INSERT,8)
    def insert_9():
        e1.insert(INSERT,9)
    def insert_0():
        e1.insert(INSERT,0)       
    def lock_action():
        lock_code=e1_var.get()
        print (lock_code)
        Button(master,width=50,height=50, text='Unlock', command=unlock).place(x=0,y=0)


    Button(locks, width=3, height=3, text='1', command =insert_1).grid(row=3,column=1)          
    Button(locks, width=3, height=3, text='2', command =insert_2).grid(row=3,column=2)
    Button(locks, width=3, height=3, text='3', command =insert_3).grid(row=3,column=3)
    Button(locks, width=3, height=3, text='4', command =insert_4).grid(row=4,column=1)
    Button(locks, width=3, height=3, text='5', command =insert_5).grid(row=4,column=2)
    Button(locks, width=3, height=3, text='6', command =insert_6).grid(row=4,column=3)
    Button(locks, width=3, height=3, text='7', command =insert_7).grid(row=5,column=1)
    Button(locks, width=3, height=3, text='8', command =insert_8).grid(row=5,column=2)
    Button(locks, width=3, height=3, text='9', command =insert_9).grid(row=5,column=3)
    Button(locks, width=3, height=3, text='Close').grid(row=6,column=1)
    Button(locks, width=3, height=3, text='0', command =insert_0).grid(row=6,column=2)
    block=Button(locks, width=3, height=3, text='Lock',command=lock_action)
    block.grid(row=6,column=3)

    def unlock():
        ulocks = Toplevel(width=500,height=500)
        ulocks.title('Unlock Screen')
        l2 = Label(ulocks,text="Enter 4 Digit Unlock Code")
        l2.grid(row=1,column=1,columnspan=3)
        e2=Entry(ulocks, bd=5)
        e2.grid(row=2,column=1,columnspan=3)
        e2_var=StringVar()
        e2["textvariable"]=e2_var


        def insert_u1():
            e2.insert(INSERT,1)
        def insert_u2():
            e2.insert(INSERT,2)
        def insert_u3():
            e2.insert(INSERT,3)
        def insert_u4():
            e2.insert(INSERT,4)
        def insert_u5():
            e2.insert(INSERT,5)
        def insert_u6():
            e2.insert(INSERT,6)
        def insert_u7():
            e2.insert(INSERT,7)
        def insert_u8():
            e2.insert(INSERT,8)
        def insert_u9():
            e2.insert(INSERT,9)
        def insert_u0():
            e2.insert(INSERT,0)       
        def unlock_action():
            unlock_code=e2_var.get()
            if lock_code==unlock_code
                Button(master,width=800, height=800, text='IT WORKS!!!!!!!').place(x=400,y=0)
                else if
                Button(master,width=800,height=800, text='It doesnt work :-(').place(x=20,y=0)

        Button(ulocks, width=3, height=3, text='1', command =insert_u1).grid(row=3,column=1)          
        Button(ulocks, width=3, height=3, text='2', command =insert_u2).grid(row=3,column=2)
        Button(ulocks, width=3, height=3, text='3', command =insert_u3).grid(row=3,column=3)
        Button(ulocks, width=3, height=3, text='4', command =insert_u4).grid(row=4,column=1)
        Button(ulocks, width=3, height=3, text='5', command =insert_u5).grid(row=4,column=2)
        Button(ulocks, width=3, height=3, text='6', command =insert_u6).grid(row=4,column=3)
        Button(ulocks, width=3, height=3, text='7', command =insert_u7).grid(row=5,column=1)
        Button(ulocks, width=3, height=3, text='8', command =insert_u8).grid(row=5,column=2)
        Button(ulocks, width=3, height=3, text='9', command =insert_u9).grid(row=5,column=3)
        Button(ulocks, width=3, height=3, text='Close').grid(row=6,column=1)
        Button(ulocks, width=3, height=3, text='0', command =insert_u0).grid(row=6,column=2)
        Button(ulocks, width=3, height=3, text='Unlock',command=unlock_action).grid(row=6,column=3)

master.mainloop()

Answer 1

The Variable Classes (BooleanVar, DoubleVar, IntVar, StringVar):

get 方法以Python 对象的形式返回变量的当前值。对于BooleanVar变量，返回值对于false为0，对于true为1。对于DoubleVar变量，返回的值是Python float。对于IntVar，它是一个整数。 对于 StringVar ，它可以是ASCII字符串或Unicode字符串，具体取决于内容。

第一个测试比较两个StringVar个对象。由于每个都是它自己的实例，因此它们是唯一的。您必须进行深度比较才能确定相等。

第二个只是字符串比较。

from Tkinter import *

if __name__ == '__main__':
    Tk()

    e1_var = StringVar()
    e2_var = StringVar()

    print 'Test 1 [Object compare]: {}'\
        .format('same' if e1_var == e2_var else 'different')
    print 'Test 2 [String compare]: {}'\
        .format('same' if e1_var.get() == e2_var.get() else 'different')

<强>输出：

Test 1 [Object compare]: different
Test 2 [String compare]: same

如何使用if语句比较两个变量？

1 个答案: