Tkinter的按钮实例没有调用方法

Question

我收到没有__call__方法的按钮实例。我已经检查并尝试了一切（至少我是这么认为的）。有人可以解释为什么发生这种情况？

#! python2 
#find_file.py - program will find every file with file format 
#which user will input and then will copy all files to new folder 

from Tkinter import * 
import tkMessageBox, os, shutil 

def launch_start(): 
    #Input folder path to check 
    check_folder_path = cfp_string.get() 
    selective_copy(check_folder_path) 

#screen buttons 
def selective_copy(folder): 
    #walk through folder tree 
    for folderName, subfolders, filenames in os.walk(folder): 
     #print("Enter the new folder path: ") 
     new_folder_path = nfp_string.get() 
     os.mkdir(new_folder_path) 
     #print("Enter file extension:") 
     file_extension = fe_string.get() 
     for filename in filenames: 
      #for file nam need to add full path 
      full_file_name = os.path.join(folder, filename) 
      if filename.endswith(file_extension): 
       #print("This is png file in this folder.") 
       shutil.copy(full_file_name, new_folder_path) 
       #print(filename, "\n") 
     break 

#main window 
window = Tk() 
window.title("_Find your files_") 
window.geometry("580x210") 
frame = Frame(window) 
frame.pack() 

我是Python的新手，但这已经困扰了我好几天。

# first text and entry box 
fe_string = StringVar() 
file_extension_message = Label(frame, text="Enter file extension:", fg="black") 
file_extension_message.grid(row=0, column=0,padx=20, pady=10) 
file_extension_E = Entry(frame, textvariable=fe_string) 
file_extension_E.grid(row=0, column=1, padx=20, pady=20) 
cfp_string = StringVar() 
check_folder_message = Label(frame, text="Enter the path,\nwhere you want to check for files:", fg="black") 
check_folder_message.grid(row=50, column=0, padx=20, pady=20) 
check_folder_path_E = Entry(frame, textvariable=cfp_string) 
check_folder_path_E.grid(row=50, column=1, padx=20, pady=20) 
nfp_string = StringVar() 
new_folder_message = Label(frame, text="Enter the path of new folder, \nwhere you want to collect your files:", fg="black") 
new_folder_message.grid(row=100, column=0, padx=20, pady=20) 
new_folder_path_E = Entry(frame, textvariable=nfp_string) 
new_folder_path_E.grid(row=100, column=1, padx=20, pady=20) 

#Button 
selective_copy = Button(frame, text="Find and copy files", command=launch_start, width=20, height=1) 
selective_copy.grid(row=100, column=2, padx=20, pady=20) 

window.mainloop() 

Answer 1

你第一次定义方法selective_copy，但随后通过使用相同的名称定义一个新的Button覆盖。确保你为不同的对象使用不同的变量名称。

你会得到例外，因为Button对象不能被称为函数。