如何在Tkinter中获取按钮控件文本？调用cget方法失效问题求解

错误原因 #

• 你在创建组件时直接链式调用了place()方法，Tkinter的pack/grid/place三大布局方法返回值都是None，所以你赋值给dataset_1/random_forest这些变量的其实是None，调用cget方法自然会报错。
• 你用普通Button来做数据集选择，没有做选中状态标记，没法判断用户选了哪个数据集，改成单选框组件更符合选择场景。
• 算法选择的单选框value属性现在设的是Male/Female，和实际选项文本不对应，拿到值也没法判断选的是哪个算法。
• printit函数要定义在组件创建之前，不然组件绑定command的时候找不到这个函数会报错。
• 窗口高度只有600，你把提示Label放在y=780的位置超出窗口范围，无法正常显示。

修正后可运行代码 #

from tkinter import *

def printit():
    # 读取选中的数据集
    selected_dataset = dataset_var.get()
    # 读取选中的算法
    selected_algo = algo_var.get()
    # 仅当两个选项都选中才执行逻辑
    if selected_dataset and selected_algo:
        if selected_dataset == "dataset 1" and selected_algo == "Random Forest":
            Label(win,text="yes",fg="blue",bg="yellow",font = ("Calibri 10 bold")).place(x=12,y=500)
        else:
            Label(win,text=f"已选择：{selected_dataset} + {selected_algo}",fg="blue",bg="yellow",font = ("Calibri 10 bold")).place(x=12,y=500)

win =  Tk()
win.geometry("400x600")
win.configure(background="cyan")
win.title("Registration Form")

title = Label(win, text="Ensemble Methods", bg="gray", width="300", height="2", fg="white", font = ("Calibri 20 bold italic underline")).pack()

# 数据集改为单选框实现选择逻辑
dataset_var = StringVar()
dataset_1 = Radiobutton(win, text="dataset 1", width="12",height="1",activebackground="violet", bg="Pink",variable=dataset_var,value="dataset 1",font = ("Calibri 12 "))
dataset_1.place(x=20, y=200)
dataset_2 = Radiobutton(win, text="dataset 2", width="12",height="1",activebackground="violet", bg="Pink",variable=dataset_var,value="dataset 2",font = ("Calibri 12 "))
dataset_2.place(x=150, y=200)
dataset_3 = Radiobutton(win, text="dataset 3", width="12",height="1",activebackground="violet", bg="Pink",variable=dataset_var,value="dataset 3",font = ("Calibri 12 "))
dataset_3.place(x=280, y=200)

# 修正算法单选框的value属性，和选项文本对应
algo_var = StringVar()
random_forest = Radiobutton(win, text="Random Forest",bg="cyan",variable=algo_var,value="Random Forest",font = ("Verdana 12"))
random_forest.place(x=20,y=340)
AdaBoost = Radiobutton(win, text="Ada Boost",bg="cyan",variable=algo_var,value="Ada Boost",font = ("Verdana 12"))
AdaBoost.place(x=280,y=340)

submit = Button(win, text="Submit", width="12",height="1",activebackground="violet", bg="Pink",command=printit,font = ("Calibri 12 "))
submit.place(x=240, y=540)

win.mainloop()

内容的提问来源于stack exchange，提问作者mouhamad