tkinter / python3.7程序无法识别变量定义

Question

程序运行正常，但是当我在输入框中输入名称并单击搜索按钮时，它显示以下错误：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Familiar\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:\Users\Familiar\Google Drive\Office Sync\Python programs and exercises\CAdminGUI.py", line 41, in findclient
    print(clientes[crit])
NameError: 

name 'crit' is not defined

下面您将找到我使用的代码：

#!/usr/bin/python3

from tkinter import *
from tkinter import ttk

class BuscarCl:

    def __init__(self,master):

        self.label = ttk.Label(master, text = 'Administrador De Clientes')
        self.label.grid(row = 0, column = 0, columnspan = 2)

        #Nombre del cliente
        entry = ttk.Entry(master, width = 30)
        entry.grid(row = 1, column = 1)
        entry.insert(INSERT, "Nombre y apellido a buscar ")
        crit = entry.get()

        entry2 = ttk.Entry(master, width = 50)
        entry2.grid(row = 2, column = 1)
        entry2.insert(INSERT, "Escriba el nombre del cliente a agregar ")

        entry3 = ttk.Entry(master, width = 80)
        entry3.grid(row = 3, column = 1)
        entry3.insert(INSERT, "Escriba la info de cliente separada por 
        espacios ")



       srchbutton = ttk.Button(master, text = "Buscar", 
                    command = self.findclient).grid(row = 1, column= 2  )



       addbutton = ttk.Button(master, text = "Ingresar Cliente", 
                        command = self.addclient).grid(row = 3, column = 0)     




    def findclient(self):
        print(clientes[crit])

    def addclient(self):
        custinfo = []
        for infor in entry2.split():
            custinfo.append(infor)
            clientes[entry2] = entry3





    clientes = {'ricardo guerrero':['11206709', 'Nueva_Eps', 'Riesgo4', 
    'Compensar', 'colpensiones'], 'doris santos' : ['52301828', 'Nueva_Eps', 
    'Riesgo: 1']}

    def main():            

        root = Tk()
        app = BuscarCl(root)
        root.mainloop()

    if __name__ == "__main__": main()