问题描述
我正在努力使我的方法正常工作。我曾考虑过使用lambda
函数,该函数是我针对另一个问题所做的,并且确实有效,但是在这里似乎不起作用。我试图将函数更改为方法,由于某种原因,我的方法无法正常工作,因为它没有对树的引用。我试过使用lambda
函数,尽管不起作用。
我的错误:
NameError: name 'tree' is not defined
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python3.8/tkinter/__init__.py",line 1883,in __call__
return self.func(*args)
File "/home/bitvivaz/Documents/Software Development/Python/PasswordManager/mainFrame.py",line 54,in select
print([tree.item(x) for x in tree.selection()])
NameError: name 'tree' is not defined
这是我的代码:
import tkinter as tk
import tkinter.ttk as ttk
from encryption import encrypted_password,decrypt_password
import backend as db
def get_credentials(tree):
'''Retrieves all credentials from the database and inserts it into the tree widget'''
for row in db.show_credentials():
tree.insert("",'end',text=row['name'],values=(
row['username'],decrypt_password(row['password'])))
class MainframeApp:
def __init__(self,master=None):
# build ui
frame_main = ttk.Frame(master)
frame_main.config(height='600',width='600')
frame_main.grid()
# Creates tree widget
tree = ttk.Treeview(frame_main)
tree["columns"] = ("one","two")
tree.column("#0")
tree.column("one")
tree.column("two")
tree.heading("#0",text="Website")
tree.heading("one",text="Username")
tree.heading("two",text="Password")
tree.grid(padx='5',pady='5',rowspan='20')
get_credentials(tree)
tree.bind("<<TreeviewSelect>>",self.select,"+")
button_add = ttk.Button(frame_main)
button_add.config(text='Add')
button_add.grid(column='1',padx='5',row='0')
button_delete = ttk.Button(frame_main)
button_delete.config(text='Delete')
button_delete.grid(column='1',row='1')
button_logout = ttk.Button(frame_main)
button_logout.config(text='Logout')
button_logout.grid(column='1',row='2')
# Main widget
self.mainwindow = frame_main
def select(self,e):
print([tree.item(x) for x in tree.selection()])
def run(self):
self.mainwindow.mainloop()
if __name__ == '__main__':
root = tk.Tk()
root.title("Password Manager")
app = MainframeApp(root)
app.run()
解决方法
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