从tkinter窗口中删除文本？

这是mainProgram（）：

def mainProgram():
    typedCountry = e.get()
    Country = typedCountry.lower()
    print 'Your country is: ' + typedCountry + '\n'
    if Country in bannedCountries:
        banned(typedCountry)
    if Country in cpBannedCountries:
        cpBanned(typedCountry)
    if Country in skrillBannedCountries:
        skrillBanned(typedCountry)
    if Country in bacsCountries:
        Bacs(typedCountry)
    if Country in sepaCountries:
        sepa(typedCountry)
    if Country in eftCountries:
        eft(typedCountry)
    if Country in ltdCountries:
        ltd(typedCountry)
    if Country in marketsCountries:
        markets(typedCountry)

我要求用户在一个框中输入一个国家/地区，我有几个不同国家/地区的列表，并检查用户输入是否与每个列表中的任何国家/地区匹配 . 如果是的话，我运行一个单独的函数来打印一行 .

这是主要的tkinter代码

master = Tk()
e = Entry(master)
e.pack()
e.focus_set()

def clear_text():
        #WHAT TO ENTER HERE???

b = Button(master, text = "Search", bg="lightyellow", command = mainProgram)
b.pack()

c = Button(master, text="Quit", bg="orange",
          command=master.quit)
c.pack()
d = Button(master, text="Clear", bg="orange",
          command=clear_text)
d.pack()
mainloop()

在此之前，我有几个不同国家的列表，以及十几个只为用户打印东西的功能，这里没有关系 .

我使用tkinter创建一个输入框，用户可以在其中键入国家（输入分配给typedCountry）和三个按钮：搜索，清除和退出 . 搜索运行mainProgram（）函数，返回的函数将打印到tkinter框 . 但是，因为我不确切知道它的打印位置，所以我不知道如何告诉Clear按钮删除文本框的内容而不完全破坏它 .

这就是我搜索说美国时的样子：

https://i.stack.imgur.com/mPCBm.jpg

然后我搜索奥地利：

https://i.stack.imgur.com/omJPV.jpg

如您所见，一个打印在另一个下方，但我需要将它们从开箱即用中清除 . 由于我不知道tkinter在哪里打印这个，所以无论我做什么，我都无法清除它 .

如果它有帮助，这是主要代码

# -*- coding: utf-8 -*-

from tkinter import *
import tkMessageBox
import os


allCountries = ['afghanistan','aland','albania','algeria','american samoa','andorra',
'angola','anguilla','argentina','armenia','aruba','australia','austria','bahamas',
'bahrain','bangladesh','barbados','belarus','belgium','belize','benin','bermuda',
'bhutan','bolivia','bonaire','bosnia and herzegovina','botswana','brazil','brunei',
'bulgaria','burkina faso','burma','burundi','cambodia','cameroon','cape verde',
'cayman islands','central african republic','chad','colombia','comoros','congo',
'cook islands','costa rica','cote d\'ivoire','crimea','croatia','cuba','cyprus',
'czech republic','denmark','djibouti','dominican republic','ecuador','egypt',
'el salvador','equatorial guinea','eritrea','estonia','ethiopia','falkland islands (malvinas)',
'faroe islands','finland','france','gabon','gambia','germany','ghana','greece',
'greenland','grenada','guam','guatemala','guinea','guinea-bissau','guyana',
'haiti','hungary','iceland','india','iran','iraq','ireland','italy','jamaica',
'japan','jordan','kazakhstan','kenya','kiribati','kosovo','kuwait','kyrgyzstan',
'laos','latvia','lebanon','lesotho','liberia','libya','liechtenstein','lithuania',
'luxembourg','macao','macedonia','madagascar','malawi','malaysia','maldives',
'mali','malta','marshall islands','martinique','mauritania','mauritius','mayotte',
'mexico','micronesia','moldova','monaco','mongolia','montenegro','montserrat',
'morocco','mozambique','myanmar','namibia','nauru','nepal','netherlands','new zealand',
'nicaragua','niger','nigeria','north korea','northern mariana islands','norway',
'oman','pakistan','palau','panama','papua new guinea','paraguay','peru','philippines',
'poland','portugal','puerto rico','qatar','romania','russia','rwanda','saint helena',
'saint kitts and nevis','saint lucia','saint vincent and the grenadines','samoa',
'sao tome and principe','saudi arabia','senegal','serbia','seychelles','sierra leone',
'singapore','slovakia','slovenia','solomon islands','somalia','south africa','south korea',
'spain','sri lanka','sudan','suriname','swaziland','sweden','switzerland','syria',
'taiwan','tajikistan','tanzania','thailand','togo','tokelau','tonga','trinidad and tobago',
'tunisia','turkey','turkmenistan','turks and caicos islands','tuvalu','uganda','ukraine',
'united kingdom','united states','uruguay','uzbekistan','vanuatu','venezuela',
'virgin islands, u.s.','western sahara','yemen','zambia','zimbabwe','palestine'
]

bannedCountries = ['afghanistan','american samoa','belarus','brazil','burundi',
'central african republic','crimea','congo','cook islands','cote d\'ivoire','crimea','cuba',
'guam','iran','japan','liberia','libya','myanmar','new zealand','north korea',
'northern mariana islands','puerto rico','russia','singapore','somalia','south korea',
'sudan','south sudan','syria','tokelau','turkey','ukraine','united states','vanuatu','virgin islands',
'western sahara','zimbabwe', 'timor-leste']

cpBannedCountries = ['venezuela','united states','belarus','bosnia and herzegovina',
'burundi','cote d\'ivoire','cuba','iran','iraq','kosovo','lebanon','liberia',
'macedonia','montenegro','myanmar',
'nigeria','north korea','saint helena','somalia','sudan']

skrillBannedCountries = ['angola','barbados','benin','burkina faso','cape verde',
'comoros','djibouti','faroe islands','gambia','greenland','grenada','guyana','laos',
'liechtenstein','macao','martinique','mongolia','namibia','niger','palau','samoa',
'suriname','tajikistan','togo','trinidad and tobago','turkmenistan']

bacsCountries = ["united kingdom",'ireland']

eftCountries = ['australia']

sepaCountries = ['austria','belgium','bulgaria','croatia','cyprus','czech republic','check',
'denmark','estonia','finland','france','french guiana','germany','greece','gibraltar',
'hungary','iceland','guadeloupe'
'ireland','italy','latvia','liechtenstein','lithuania','luxembourg','malta',
'martinique','mayotte','monaco','netherlands','norway','poland','portugal',
'romania','slovakia','slovenia','spain','sweden','switzerland','united kingdom']

ltdCountries = ['austria','belgium','bulgaria','croatia','cyprus','czech republic',
'colombia','denmark','estonia','finland','france','germany','greece','hungary','ireland',
'italy','latvia','lithuania','luxembourg','malta','netherlands','poland','portugal',
'romania','slovakia','slovenia','spain','united kingdom']

marketsCountries = ['albania','algeria','andorra','angola','anguilla','armenia',
'aruba','bahamas','bangladesh','barbados','belize','benin','bermuda','bhutan',
'bonaire','bosnia','herzegovina','bosnia and herzegovina','botswana','brunei',
'burkina faso','burma','cambodia','cameroon','cape verde','cayman islands',
'chad','comoros','djibouti','equatorial guinea','eritrea','ethiopia','falkland islands (malvinas)',
'faroe islands','gabon','gambia','ghana','greenland','grenada','guinea','guinea-bissau',
'guyana','haiti','iceland','india','jamaica','jordan','kazakhstan','kenya',
'kiribati','kosovo','kyrgyzstan','laos','lesotho','liechtenstein','macao',
'macedonia','madagascar','malawi','malaysia','maldives','mali','marshall islands',
'mauritania','mauritius','micronesia','mongolia','morocco','mozambique','namibia',
'nauru','nepal','niger','nigeria','norway','pakistan','palau','papua new guinea',
'philippines','rwanda','saint helena','saint kitts and nevis','saint lucia','saint vincent and the grenadines',
'samoa','sao tome and principe','senegal','serbia','seychelles','sierra leone',
'solomon islands','sri lanka','suriname','swaziland','tajikistan','tanzania','togo',
'tonga','trinidad and tobago','tunisia','turkmenistan','turks and caicos islands','tuvalu',
'uganda','uzbekistan','yemen','zambia','palestine']

ibanCountries = [
'lebanon', 'albania','andorra','austria', 'azerbaijan','bahrain','belgium','bosnia and herzegovina',
'brazil','bulgaria','croatia','cyprus','czech republic','denmark', "estonia",'faroe islands',
'finland','france','french guiana','germany','gibraltar','greece','guadeloupe','guernsey','hungary',
'iceland','ireland','isle of man','israel','italy','jersey','jordan','kuwait','latvia','liechtenstein',
'lithuania','luxembourg','macedonia','malta','martinique','mauritania','mauritius','mayotte',
'moldova','monaco','montenegro','netherlands','norway','pakistan','poland','portugal',
'qatar','reunion','romania','san marino','saudi arabia','serbia','slovakia','slovenia','spain',
'sweden','switzerland','united kingdom','saint barthelemy','saint martin','saint pierre and miquelon',
'tunisia','united arab emirates','kosovo'
]

noLPOACountries = ['austria', 'belgium','bulgaria','croatia','cyprus', 'czech republic',
'denmark', "estonia",'finland','france','germany','greece','hungary','iceland','ireland',
'italy','latvia','liechtenstein','lithuania','luxembourg','malta','netherlands',
'norway','poland','portugal','romania','slovakia','slovenia','spain','sweden','switzerland']

max50cpCountries = ['france','germany','greece','italy']

zuluBannedCountries = ['italy']

idchecklistCountries =['kenya']

nonidchecklistCountries = ['jordan','kuwait','oman','qatar','saudi arabia',
'united arab emirates']





def banned(x):
    if 'kingdom' not in x:
        Label(master, text="""Clients from %s cannot apply for a live account with FXCM.""" % x).pack()
    else:
        return
def cpBanned(x):
    Label(master, text="""Clients from %s cannot use credit/debit cards.""" % x).pack()

def cpAllowed(x):
    Label(master, text="Clients from %s can deposit with credit cards." % x).pack()

def skrillBanned(x):
    Label(master, text="Clients from %s cannot use Skrill" % x).pack()

def Bacs(x):
    Label(master, text="""Clients from %s can use BACS if their bank account is located in
%s and both their bank account and their FXCM account is in GBP.\nClients from %s can
apply for a Spreadbetting account.""" % (x, x, x)).pack()

def sepa(x):
    Label(master, text="""Clients from %s can use SEPA if their bank account is located either in
%s or in another European country, and both their bank account and their FXCM account is in EUR.
Clients from %s can have a maximum leverage of 200:1.""" % (x, x, x)).pack()

def eft(x):
    Label(master, text="""Clients from %s can use EFT if their bank account is located in
%s, and both their bank account and their FXCM account is in AUD.\nClients in %s must open with FXCM AU""" % (x, x, x)).pack()

def ltd(x):
    Label(master, text="Clients from %s must open with FXCM LTD" % x).pack()

def markets(x):
    Label(master, text="Clients from %s must open with FXCM Markets" % x).pack()

def noLPOA(x):
    Label(master, text="""All traders (MMs, IBs, family members, etc.) domiciled
within %s and/or managing funds for residents of %s must be regulated.
Managers acquiring clients across %s must have the appropriate passport or license
to do so.""" % (x, x, x)).pack()

def iban(x):
    lbl['text'] = "IBAN is required for all wire withdrawals with a beneficiary bank account located in %s." % x

def max50cp(x):
    Label(master, text="Residents of %s are NOT eligible for the ATG 50K CP deposit maximum. " % x).pack()

def zulu(x):
    Label(master, text="Residents of %s cannot use ZuluTrader. " % x).pack()

def idchecklist(x):
    Label(master, text="""For applicants residing in %s who have difficulty
    submitting a valid proof of residence, we can accept the ID checklist
    as an alternative. In addition, these clients will only be required
    to submit one photo ID and P.O. box proof of residence with the ID
    Checklist in lieu of two photo IDs.
    """ % x).pack()

def nonidchecklist(x):
    Label(master, text="""For applicants from %s who have difficulty submitting
    a valid proof of residence and reside in Kuwait, they are not required to
    send in an ID checklist or extra ID when submitting a POR listing a P.O.
    Box as long as the city/state matches the application. If the city/ state
    does not match, the ID checklist is required to satisfy the account opening
    requirements
    """ % x).pack()

def notFound(x):
    Label(master, text="Country %s was not found, please try again" % x).pack()

def printAsterix():
    Label(master, text="*"*40).pack()


def mainProgram():
    typedCountry = e.get() # This is the text you may want to use later

    if not typedCountry:
        return
    lowerCountry = typedCountry.lower()
    upperCountry = typedCountry.title()

    if lowerCountry in bannedCountries: #banned countries
        banned(upperCountry)
    if lowerCountry in cpBannedCountries:#cp banned countries
        cpBanned(upperCountry)
    if lowerCountry in skrillBannedCountries: #skrill banned countries
        skrillBanned(upperCountry)
    if lowerCountry not in cpBannedCountries and lowerCountry not in bannedCountries and lowerCountry in allCountries:
        cpAllowed(upperCountry) #cp allowed countries
    if lowerCountry in sepaCountries: #sepa allowed countries (EEA)
        sepa(upperCountry)
    if lowerCountry in eftCountries: #eft allowed countries (AU)
        eft(upperCountry)
    if lowerCountry in ltdCountries: #LTD required
        ltd(upperCountry)
    if lowerCountry in marketsCountries: #markets required
        markets(upperCountry)
    if lowerCountry in noLPOACountries: #lpoa not available
        noLPOA(upperCountry)
    if lowerCountry in ibanCountries: #iban required
        iban(upperCountry)
    if lowerCountry in max50cpCountries:
        max50cp(upperCountry)
    if lowerCountry in zuluBannedCountries:
        zulu(upperCountry)
    if lowerCountry in idchecklistCountries:
        idchecklist(upperCountry)
    if lowerCountry in nonidchecklistCountries:
        nonidchecklist(upperCountry)
    if lowerCountry not in allCountries: #not found
        notFound(typedCountry)

    printAsterix()


master = Tk()
e = Entry(master)
e.pack()
e.focus_set()

def clear_text():
        lbl.withdraw()

b = Button(master, text = "Search", bg="lightyellow", command = mainProgram)
b.pack()

c = Button(master, text="Quit", bg="orange",
          command=master.quit)
c.pack()
d = Button(master, text="Clear", bg="orange",
          command=clear_text)
d.pack()
mainloop()