Question

我正在尝试使用tkinter创建caesar密码程序，当我尝试将用户的Entry从字符串转换为Int时我得到此错误：AttributeError：＆＃39; str＆＃39;对象没有属性＆＃39; _root＆＃39;。我已经尝试过使用＆＃39; stextentry = int（stextentry）＆＃39;我知道它的工作原理，但我需要使用该脚本的其他版本的代码来处理另一个程序。我不知道如何摆脱这个错误，所以我希望有人可以帮助我，顺便说一句，这不是家庭作业，也不与学校有任何关系。

from tkinter import *
def Encryption():

    ptextentry = ptext.get()
    stextentry = stext.get()
    stextentry = IntVar(stextentry)# <------------------- Error is here
    alpha = "abcdefghijklmnopqrstuvwxyz"
    cipher = " "
    for c in ptextentry:
        if c in alpha:
            cipher += alpha[(alpha.index(c)+stextentry) % (len(alpha))]
    print (cipher)
global P_Text_E, P_Text_L, S_K_L, S_K_E, plain_text, cctk
cctk = Tk()
ptext = StringVar()
stext = StringVar()
P_Text_L = Label(cctk, text="Enter plain text:").grid(row=0, column=0)
P_Text_E = Entry(cctk, textvariable=ptext).grid(row=0, column=1)
S_K_L = Label(cctk, text="Enter shift key:").grid(row=1, column=0)
S_K_E = Entry(cctk, textvariable=stext).grid(row=1, column=1)
Encrypt_B = Button(cctk, text="Encrypt plain text", command = Encryption).grid(row=2, columnspan =3)
Exit_cctk_B = Button(cctk, text="Exit").grid(row=3, columnspan =3)
cctk.title("Caesar Cipher Program")
cctk.mainloop()**

Answer 1

stextentry = IntVar(value=stextentry)

没有value=的单个参数被视为parent，因此您可以执行

stextentry = IntVar(cctk)
stextentry.set(stextentry)

或

stextentry = IntVar(cctk, stextentry)

但你可以在一行

stextentry = IntVar(value=stext.get())

但现在stextentry为IntVar，因此您必须在

中使用stextentry.get()

cipher += alpha[(alpha.index(c) + stextentry.get() ) % (len(alpha))]

BTW：如果你这样做

 var = Widget(...).grid(...)
 var = Widget(...).pack(...)

然后您将None分配给var，因为grid() / pack()始终返回None

你需要分两行

 var = Widget(...)
 var.grid(...)

或没有变量

 Widget(...).grid(...)

编辑：完整代码 - 更具可读性：更好的变量名称，空行。

import tkinter as tk
import string

# --- constants --- (UPPER_CASE names)

ALPHA = string.ascii_lowercase
LENGTH = len(ALPHA)

# --- functions --- (lower_case names)

def encryption():

    cipher = ""

    for char in plain_text.get():
        if char in ALPHA:
            cipher += ALPHA[(ALPHA.index(char) + shift_int.get()) % LENGTH]

    result_text.set(cipher)

    print(cipher)

# --- main ---

cctk = tk.Tk()
cctk.title("Caesar Cipher Program")

plain_text = tk.StringVar()
shift_int = tk.IntVar()
result_text = tk.StringVar()

l = tk.Label(cctk, text="Enter plain text:", anchor="e")
l.grid(row=0, column=0, sticky="e")

e = tk.Entry(cctk, textvariable=plain_text)
e.grid(row=0, column=1)

l = tk.Label(cctk, text="Enter shift key:", anchor="e")
l.grid(row=1, column=0, sticky="e")

e = tk.Entry(cctk, textvariable=shift_int)
e.grid(row=1, column=1)

b = tk.Button(cctk, text="Encrypt plain text", command=encryption)
b.grid(row=2, columnspan=2)

l = tk.Label(cctk, text="Result:", anchor="e")
l.grid(row=3, column=0, sticky="e")

l = tk.Label(cctk, textvariable=result_text, anchor="w") # place for result
l.grid(row=3, column=1, sticky="w")

b = tk.Button(cctk, text="Exit", command=cctk.destroy)
b.grid(row=4, columnspan=2)

cctk.mainloop()

AttributeError：＆＃39; str＆＃39;对象没有属性＆＃39; _root＆＃39;

1 个答案: