这是我正在调用的类，并且是来自其他文件的函数

class CalcFunc:

def clearScreen(self):

self.log("CLEAR (CE)")

ent.delete(0, END)

这是输入框

ent = Entry(root, textvariable=clc.getBtn, justify=RIGHT, font=10, relief=RIDGE, bd=2, width=15)

ent.grid(row=0, columnspan=3, pady=10)

这是我单击以清除输入框的按钮

buttonCC = Button(root, text="CLEAR (CE)", height=1, width=20, bg='orange', command=clc.clearScreen)

我不确定基本从类中清除Entry小部件的语法是什么。当我将其保存在同一文件中时，该代码有效，但是我的项目要求将其保存在单独的文件中。这是一个计算器的类项目，“清除”按钮清除了Entry小部件。如果有帮助，我可以发布我的整个代码。谢谢。

- - 编辑 - -

我的课

import time

class CalcFunc:

def log(self, val):

myFile = open(r".\log.dat", "a")

myFile.write("%s\n" % val)

myFile.close()

def onScreen(self, iVal):

self.log(iVal)

currentTxt = self.getBtn.get()

updateEnt = self.getBtn.set(currentTxt + iVal)

def clearScreen(self):

self.log("CLEAR (CE)")

ent.delete(0, END)

def evaL(self):

self.log("=")

self.getBtn.set(str(eval(self.getBtn.get())))

self.log(self.getBtn.get())

def logLbl(self):

myFile = open(r".\log.dat", "a")

myFile.write("\n==================================\n")

myFile.write("Date: " + str(time.strftime("%m/%d/%Y")) + " -- Time: " + str(time.strftime("%I:%M:%S")))

myFile.write("\n==================================\n")

myFile.close()

我的程序

from tkinter import *

import time

import clcClass

root = Tk()

root.title('skClc v1')

clc = clcClass.CalcFunc()

clc.logLbl()

clc.getBtn = StringVar()

ent = Entry(root, textvariable=clc.getBtn, justify=RIGHT, font=10, relief=RIDGE, bd=2, width=15)

ent.grid(row=0, columnspan=3, pady=10)

button1 = Button(root, text="1", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('1'))

button2 = Button(root, text="2", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('2'))

button3 = Button(root, text="3", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('3'))

button4 = Button(root, text="4", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('4'))

button5 = Button(root, text="5", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('5'))

button6 = Button(root, text="6", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('6'))

button7 = Button(root, text="7", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('7'))

button8 = Button(root, text="8", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('8'))

button9 = Button(root, text="9", height=1, width=5, bg='light blue', command=lambda:clc.onScreen('9'))

button0 = Button(root, text="0", height=1, width=5, bg='light blue', command=lambda:onScreen('0'))

buttonP = Button(root, text="+", height=1, width=5, bg='gray', command=lambda:clc.onScreen('+'))

buttonM = Button(root, text="-", height=1, width=5, bg='gray', command=lambda:clc.onScreen('-'))

buttonMM = Button(root, text="x", height=1, width=5, bg='gray', command=lambda:clc.onScreen('*'))

buttonDD = Button(root, text="÷", height=1, width=5, bg='gray', command=lambda:clc.onScreen('/'))

buttonEE = Button(root, text="=", height=1, width=5, bg='light green', command=clc.evaL)

buttonCC = Button(root, text="CLEAR (CE)", height=1, width=20, bg='orange', command=clc.clearScreen)

button1.grid(row=1, column=0, pady=5)

button2.grid(row=1, column=1, pady=5)

button3.grid(row=1, column=2, pady=5)

button4.grid(row=2, column=0, pady=5)

button5.grid(row=2, column=1, pady=5)

button6.grid(row=2, column=2, pady=5)

button7.grid(row=3, column=0, pady=5)

button8.grid(row=3, column=1, pady=5)

button9.grid(row=3, column=2, pady=5)

button0.grid(row=4, column=0, pady=5)

buttonP.grid(row=4, column=1, pady=5)

buttonM.grid(row=4, column=2, pady=5)

buttonEE.grid(row=5, column=0, pady=5)

buttonDD.grid(row=5, column=1, pady=5)

buttonMM.grid(row=5, column=2, pady=5)

buttonCC.grid(row=6, column=0, pady=5, columnspan=3)

root.maxsize(140,245);

root.minsize(140,245);

root.mainloop()

解决方案

ent = Entry(root, ....)

clc = clcClass.CalcFunc(ent)

class CalcFunc:

def __init__(self, entry):

self.entry = entry

def clearScreen(self):

self.log("CLEAR (CE)")

self.entry.delete(0, END)

这是一个简短的示例：

#my_entry.py

from tkinter import END

import time

class EntryWithLogger:

def __init__(self, entry):

self.entry = entry

def log(self, val):

with open("log.dat", "a") as my_file: #Automatically closes the file--even if an exception occurs, which is not the case with my_file.close().

my_file.write("%s\n" % val)

def onScreen(self, i_val):

self.log(i_val)

self.entry.insert(END, i_val)

def clearScreen(self):

self.log("CLEAR (CE)")

self.entry.delete(0, END)

请注意，我没有使用StringVar()，这似乎不是必需的。如果需要，可以始终将其作为参数传递给__init__()，然后将其存储在上self。

import my_entry as me

import tkinter as tk

root = tk.Tk()

root.title("Calculator")

root.geometry("+100+50") #("300x500+200+10") dimension, position

entry = tk.Entry(root, justify=tk.RIGHT, font=10, relief=tk.RIDGE, bd=2, width=15)

entry.grid(row=0, columnspan=3, pady=10)

entry_with_logger = me.EntryWithLogger(entry)

#Create the buttons in a loop:

for i in range(10):

row_num, col_num = divmod(i, 3) #divmod(7, 2) => (3, 1), divmod(0, 3) => (0, 0), divmod(4, 3) => (1, 1)

row_num += 1

button_text = str(i)

tk.Button(root, text=button_text,

height=1,

width=5,

bg='light blue',

command=lambda x=button_text: entry_with_logger.onScreen(x)

).grid(row=row_num, column=col_num, pady=5)

#Put the clear button at the bottom of the grid:

tk.Button(root, text="CLEAR (CE)",

height=1,

width=20,

bg='orange',

command=entry_with_logger.clearScreen

).grid(row=row_num+1, columnspan=3) #columnspan tells grid() to use 3 cells for the button,

#and the button will be centered by default.

root.mainloop()

或者，您可以这样做：

#my_entry.py

from tkinter import Entry, END

import time

class EntryWithLogger(Entry):

#Because __init__() is not implemented, the parent class's __init__() gets

#called, so you create an EntryWithLogger just like you would an Entry.

def log(self, val):

with open("log.dat", "a") as my_file: #Automatically closes the file--even if there is an exception, which is not the case with my_file.close().

my_file.write("%s\n" % val)

def onScreen(self, i_val):

self.log(i_val)

self.insert(END, i_val)

def clearScreen(self):

self.log("CLEAR (CE)")

self.delete(0, END)

import my_entry as me

import tkinter as tk

root = tk.Tk()

root.title("Calculator")

root.geometry("+100+50") #("300x500+200+10") dimension, position

entry = me.EntryWithLogger(root, justify=tk.RIGHT, font=10, relief=tk.RIDGE, bd=2, width=15)

entry.grid(row=0, columnspan=3, pady=10)

#Create the buttons in a loop:

for i in range(10):

row_num, col_num = divmod(i, 3) #divmod(7, 2) => (3, 1), divmod(0, 3) => (0, 0), divmod(4, 3) => (1, 1)

row_num += 1

button_text = str(i)

tk.Button(root, text=button_text,

height=1,

width=5,

bg='LightBlue',

command=lambda x=button_text: entry.onScreen(x)

).grid(row=row_num, column=col_num, pady=5)

#Put the clear button at the bottom of the grid:

tk.Button(root, text="CLEAR (CE)",

height=1,

width=20,

bg='orange',

command=entry.clearScreen

).grid(row=row_num+1, columnspan=3) #columnspan tells grid() to use 3 cells for the button,

#and the button will be centered by default.

root.mainloop()