import tkinter as tk
from tkinter import ttk
root = tk.Tk()
def policy_btn():
po_save = policy_choose.get()
po_para = po_entry.get()
if po_save == "环保投资比例":
print("环保投资比例" + po_para)
elif po_save == "节能投资比例":
print("节能投资比例" + po_para)
elif po_save == "能源税税率":
print("能源税税率" + po_para)
else:
print("绿色信贷利率" + po_para)
num = 3
i = 1
while i <= num:
po_label1 = ttk.Label(root,text = "政策" + str(i))
po_label1.grid(row = i+4, column = 0, sticky=tk.W)
policy = tk.StringVar()
policy_choose = ttk.Combobox(root, textvariable=policy)
policy_choose['values'] = ("环保投资比例", "节能投资比例", "能源税税率", "绿色信贷利率")
policy_choose.grid(row=i+4, column=1)
po_label2 = ttk.Label(root,text = "参数:")
po_label2.grid(row = i+4, column = 2, sticky=tk.W)
v = tk.StringVar()
po_entry = ttk.Entry(root,textvariable = v)
po_entry.grid(row = i+4, column = 3, sticky=tk.W)
btn2 = ttk.Button(root, text = "确定", command = policy_btn)
btn2.grid(row = i+4, column = 4, sticky = tk.W)
i+=1
root.mainloop()
怎样能每次循环都有效?主要是想得到用户每次的选项,然后依次print,如果有别的方法也可以