问将数据从treeview保存到csv文件tkinter python

EN

from tkinter import *
from tkinter import ttk
from tkinter.filedialog import asksaveasfile
from tkinter.filedialog import askopenfile
from tkcalendar import Calendar,DateEntry
import csv
from tkinter.messagebox import showinfo,askquestion
    root = Tk()
root.title("Medicine database")

one = StringVar()
two = StringVar()
three = StringVar()
four = StringVar()
    def quit():
    MsgBox = askquestion('Exit Application','Are you sure you want to exit the application',icon = 'warning')
    if MsgBox == 'yes':
        root.destroy()
def save():
    with open("new.csv","w",newline='') as f:
        w=csv.writer(f, delimiter='\t')
        w.writerow(tree.get_children())
        showinfo("Save to CSV file","File was saved")
def add_medicine():
    row = tree.insert("",END,values=(e0.get(),e1.get(),e2.get(),cal1.get()))
    e0.delete(0,END)
    e1.delete(0,END)
    e2.delete(0,END)
def select(event):
    try:
        cursor = tree.focus()
        content = tree.item(cursor)
        row = content["values"]
        one.set(row[0])
        two.set(row[1])
        three.set(row[2])
    except IndexError:
        pass
def delete_all():
    for i in tree.get_children():
        tree.delete(i)
def edit():
    try:
        x = tree.selection()[0]
        for item in x:
            tree.item(x,values=(e0.get(),e1.get(),e2.get(),cal1.get()))
    except IndexError:
        pass
def remove_item():
    selected_items = tree.selection()[0]
    tree.delete(selected_items)
def open_CSV():
    with open("new.csv") as myfile:
        csvread = csv.reader(myfile,delimiter=",")
        for i in csvread:
            print(i)

tree = ttk.Treeview(root,height=25,selectmode=EXTENDED)
tree["columns"]=("one","two","three","four")
tree.column("one",width=120)
tree.column("two",width=160)
tree.column("three",width=130)
tree.column("four",width=160)
tree.heading("one", text="Numer seryjny leku")
tree.heading("two", text="Nazwa Leku")
tree.heading("three", text="Ilość ampułek")
tree.heading("four",text="Data ważności")
tree["show"]="headings"
root.mainloop()