python – 在Tkinter的’command =’中使用lambda函数.

主要：

import pdb
#pdb.set_trace()
import sys
import csv
sys.version_info
  
if sys.version_info[0] < 3:
  from Tkinter import *
else:
  from tkinter import *


from Untitled import *

main_window =Tk()
main_window.title("Welcome")


label = Label(main_window, text="Enter your current weight")
label.pack()
Current_Weight=StringVar()
Current_Weight.set("0.0")
entree1 = Entry(main_window,textvariable=Current_Weight,width=30)
entree1.pack()
bouton1 = Button(main_window, text="Enter", command= lambda evt,Current_Weight,entree1: get(evt,Current_Weight,entree1))
bouton1.pack()

在另一个文件Untitled我有“获取”功能：

def get (event,loot, entree):
    loot=float(entree.get())
    print(loot)

当我运行主时我收到以下错误：

Exception in Tkinter callback
Traceback (most recent call last):
File “/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/idlelib/run.py”, line 121, in main
seq, request = rpc.request_queue.get(block=True, timeout=0.05)
File “/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/queue.py”, line 175, in get
raise Empty
queue.Empty

在处理上述异常期间,发生了另一个异常：

Traceback(最近一次调用最后一次)：
  文件“/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/tkinter/init.py”,第1533行,正在通话中
    return self.func(* args)
TypeError :()缺少3个必需的位置参数：’evt’,’Current_Weight’和’entree1′

我怎么解决这个问题？

我认为lambda函数允许我们在依赖于事件的函数中使用一些args.

bouton1 = Button(main_window, text="Enter",
    command = lambda: get(Current_Weight, entree1))

你应该说：

def get(loot, entree):
    loot = float(entree.get())
    print(loot)