如何从 tkinter 的输入框中打印值？答案

【问题标题】：How to print the values from entry box of tkinter?如何从 tkinter 的输入框中打印值？
【发布时间】：2021-07-25 02:07:30
【问题描述】：

    from tkinter import *
    from tkinter import ttk
    win=Tk()
    Ent12=StringVar()
    wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
    wrapper.place(x=0, y=80, width=465, height=625)
    def print1_selection():
        for widget in entry_frame.winfo_children():
            widget.destroy()
        for widget in entry_frame2.winfo_children():
            widget.destroy()
        value = var1.get()

        if value == "Alphabet":
            label12=Label(entry_frame, text="Alphabet", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=6, column=0, padx=10, pady=5, sticky='w')
            Ent12 = Entry(entry_frame, width=20)
            Ent12.grid(row=6, column=1,padx=10, pady=5, sticky='w')

        elif value == "Number":
            label13=Label(entry_frame2, text="Number", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=7, column=0, padx=10, pady=5, sticky='w')
            Ent12 = Entry(entry_frame2, width=20)
            Ent12.grid(row=7, column=1,padx=10, pady=5, sticky='w')
            

    var1 = StringVar(value=0)

    entry_frame = Frame(wrapper, bg="crimson")
    entry_frame.grid(row=8, column=0, columnspan=2,padx=10, pady=5, sticky='w')

    entry_frame2 = Frame(wrapper, bg="crimson")
    entry_frame2.grid(row=9, column=0, columnspan=2,padx=10, pady=5, sticky='w')
    

    def lookup():
        print(Ent12.get())
        

    lbl4=Label(wrapper, text="Find", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=5, column=0, padx=10, pady=10, sticky='w')
    r1 = Radiobutton(wrapper, text='Alphabet',variable=var1, value='Alphabet', command=print1_selection, width=22).grid(row=6,column=0,padx=10, pady=10, sticky='w')
    r2 = Radiobutton(wrapper, text='Number', variable=var1, value='Number', command=print1_selection, width=22).grid(row=6,column=1,padx=10, pady=10, sticky='w')

    btn = Button(wrapper, text = 'Find',command=lookup , bd = '5', width=15, height=2)
    btn.grid(row=10, column=1, padx=20, pady=10)

    win.mainloop()

在这段代码中，我想根据单选按钮打印输入的字母或数字的值。此外，如果我给两个条目都赋予了相同的名称，即 Ent12 可以吗？这个命令

def lookup():
     print(Ent12.get())

什么都不输出。

【问题讨论】：

看this
@TheLizzard 尝试过，但没有任何进展
你能用建议更新问题中的代码吗？
@TheLizzard 完成，请看一下
label12、label13、lbl4、r1 和 r2 仍然存在同样的问题。我也想我找到了问题所在。

标签： python tkinter button radio-button command

【解决方案1】：

print(Ent12.get()) 获取您在开始时定义的StringVar 的值：Ent12 = StringVar()。而StringVar 与Ent12 = Entry(...) 没有任何关系。要解决此问题，您需要像这样在print1_selection 中将Ent12 变量设为全局变量：

from tkinter import *
from tkinter import ttk

win = Tk()
wrapper = Frame(win, bd=4, relief="ridge", bg="crimson")
wrapper.pack()

def print1_selection():
    global Ent12, Ent13 # Make the variables global
    for widget in entry_frame.winfo_children():
        widget.destroy()
    for widget in entry_frame2.winfo_children():
        widget.destroy()
    value = var1.get()

    if value == "Alphabet":
        label12 = Label(entry_frame, text="Alphabet", bg="crimson", fg="white",
                        font=("times new roman", 15, "bold"))
        label12.grid(row=6, column=0, padx=10, pady=5, sticky="w")
        Ent12 = Entry(entry_frame, width=20)
        Ent12.grid(row=6, column=1, padx=10, pady=5, sticky="w")

    elif value == "Number":
        label13 = Label(entry_frame2, text="Number", bg="crimson", fg="white",
                        font=("times new roman", 15, "bold"))
        label13.grid(row=7, column=0, padx=10, pady=5, sticky="w")
        Ent12 = Entry(entry_frame2, width=20)
        Ent12.grid(row=7, column=1, padx=10, pady=5, sticky="w")
        

var1 = StringVar(value=0)

entry_frame = Frame(wrapper, bg="crimson")
entry_frame.grid(row=8, column=0, columnspan=2 ,padx=10, pady=5, sticky="w")

entry_frame2 = Frame(wrapper, bg="crimson")
entry_frame2.grid(row=9, column=0, columnspan=2, padx=10, pady=5, sticky="w")


def lookup():
    print(Ent12.get())
    

lbl4 = Label(wrapper, text="Find", bg="crimson", fg="white",
             font=("times new roman", 15, "bold"))
lbl4.grid(row=5, column=0, padx=10, pady=10, sticky="w")

r1 = Radiobutton(wrapper, text="Alphabet",variable=var1, value="Alphabet",
                 command=print1_selection, width=22)
r1.grid(row=6,column=0,padx=10, pady=10, sticky="w")

r2 = Radiobutton(wrapper, text="Number", variable=var1, value="Number",
                 command=print1_selection, width=22)
r2.grid(row=6,column=1,padx=10, pady=10, sticky="w")

btn = Button(wrapper, text="Find",command=lookup, bd="5", width=15, height=2)
btn.grid(row=10, column=1, padx=20, pady=10)

win.mainloop()

【讨论】：