关于Python Tkinter 复选框 -＞Checkbutton

import tkinter as tk
windows = tk.Tk()
windows.title('复选框')
lab = tk.Label(windows, text='请选择你喜欢做的事', fg='blue', bg='lightblue', width=35)
lab.grid(row=0, pady=2)
var_b = tk.IntVar()
print(var_b.get())
check_button_b = tk.Checkbutton(windows, text='打篮球', variable=var_b)
check_button_b.grid(row=2)

var_c = tk.IntVar()
print(var_c.get())
check_button_c = tk.Checkbutton(windows, text='打豆豆', variable=var_c)
check_button_c.grid(row=3)

tk.mainloop()

check_button_a = tk.Checkbutton(windows, text='看电影')
check_button_a.grid(row=1)
 
check_button_b = tk.Checkbutton(windows, text='打篮球')
check_button_b.grid(row=2)
 
tk.mainloop()

var_b = tk.StringVar()
check_button_b = tk.Checkbutton(windows, text='打篮球', variable=var_b)
check_button_b.grid(row=2)
 
var_c = tk.StringVar()
check_button_c = tk.Checkbutton(windows, text='打豆豆', variable=var_c)
check_button_c.grid(row=3)
 
tk.mainloop()

var_b = tk.DoubleVar()
print(var_b.get())
check_button_b = tk.Checkbutton(windows, text='打篮球', variable=var_b)
check_button_b.grid(row=2)
 
var_c = tk.BooleanVar()
print(var_c.get())
check_button_c = tk.Checkbutton(windows, text='打豆豆', variable=var_c)
check_button_c.grid(row=3)
 
tk.mainloop()

var_b = tk.DoubleVar()    # 浮点型变量，默认值为 0.0
var_c = tk.BooleanVar()   # 布尔型变量，默认值为 False
var_d = tk.IntVar()       # 整形变量，默认值为 0
var_e = tk.StringVar()    # 字符串变量，默认值为 ''

import tkinter as tk
 windows = tk.Tk()
windows.title('复选框')
lab = tk.Label(windows, text='请选择你喜欢做的事', fg='blue', bg='lightblue', width=35)
lab.grid(row=0, pady=2)
def print_info():
    a = ''
    for j in select_all:
        if select_all[j].get() == True:
            a = a + enjoyment[j] + '\t'
    print(a)
enjoyment = {0: "打篮球", 1: "踢足球", 2: "看电影", 3: "打豆豆", 4: "演   讲", 5: "撸代码"}
select_all = {}
for i in range(len(enjoyment)):
    select_all[i] = tk.BooleanVar()
    tk.Checkbutton(windows, text=enjoyment[i], variable=select_all[i]).grid(row=i+1)
 
btn = tk.Button(windows, text='确定', command=print_info).grid(pady=2)
tk.mainloop()