python - 如何使我的代码与最初的目的相反

Question

我在 python 中有一个反向密码代码，我想反转它，以便它解码反转的字符串：

代码：

message = text.get()

translated = (" ")
i = len(message) - 1

while i >= 0:
    translated = translated + message[i]
    i = i - 1

print(translated)

编辑：

message = text.get()

translated = (" ")
i = len(message) - 1

while i >= 0:
    translated = translated + message[i]
    i = i - 1

print(translated)

# Creating a string
s = message
# Encoding the string into bytes
b = s.encode("UTF-8")
# Base32 Encode the bytes
e = base64.b32encode(b)
# Decoding the Base32 bytes to string
s1 = e.decode("UTF-8")
# Printing Base32 encoded string
print(s1)
messagebox.showinfo("Encrypted", s1)

def decrypt():
    base64.b32decode(s1)
    translated[::-1]

以上是加密和解密的全部代码

标签： pythonpython-3.x

Answer 1

您可以使用 python 切片

translated[::-1] # reverses the "translated"

例如，如果你输入“你好”，它变成了olleh，如果你想再次反转它（解码）你所要做的就是使用拼接 "olleh"[::-1]，它给出hello

message = input("enter msg: ")
translated = (" ")
i = len(message) - 1
while i >= 0:
    translated = translated + message[i]
    i = i - 1

print("Encoded: ", translated)
print("Decoded: ", translated[::-1]) # decode it back to normal by reversing it

结果：

Encoded: albalb
Decoded: blabla

---

编辑（操作在评论中发布了完整的代码）：

我相信这就是你要找的。

#Encryption GUI
from tkinter import *
from tkinter import messagebox
import base64

"""
    You have two functions right? one is `encrypt` and the other is `decrypt`.
    Now variable `e` which contains the encypted msg it only visible to the scope of `encrypt` function.
    Meaning that `decrypt` does not know that it exists at all.
"""

# a global variable to store
# both encrypt and decrypt will be able to see this variable
message = ""

#Sub-Routine
def encrypt():

    # Tell python to find the global variable `message`
    global message

    # get input and reverse it using splice
    # "blabla"[::-1] => "albalb"
    message = text.get()[::-1]

    # Encoding the message into bytes
    message = message.encode("UTF-8")

    # Base32 Encode the bytes
    message = base64.b32encode(message)


    # temporarily decode and print encrpyted msg
    # decoding is to make it human-readable (it's only in this function, won't affect anything else)
    e = message.decode("UTF-8")
    messagebox.showinfo("Encrypted", e)

def decrypt():
    # again, tell python to find the global variable
    # we need it! it contains our secret message
    global message

    # decode message
    message = base64.b32decode(message)

    # finally print it
    print("Decrypted", message[::-1].decode("UTF-8"))


#Main
root=Tk()
root.geometry("500x425")
root.title("HORIZON Encryption")
root.resizable(True,True)
root.configure(bg='gray95')

#Frame Heading
frame_heading=Frame(root)
frame_heading.grid(row=0,column=0,columnspan=3,padx=30,pady=5)
frame_entry=Frame(root)
frame_entry.grid(row=1,column=0,columnspan=3,padx=25,pady=10)

#Labels
Label(frame_heading,text="HORIZON Encryption").grid(row=0,column=0,padx=0,pady=5)
Label(frame_entry,text="Text: ").grid(row=0,column=0,padx=10,pady=10)

text=Entry(frame_entry,width=15,bg='white')
text.grid(row=0,column=1,padx=5,pady=5)

#Buttons
encrypt_button=Button(root,text="Encrypt",width=7,command=encrypt)
encrypt_button.grid(row=2,column=1,padx=0,pady=5)

decrypt_button=Button(root,text="Decrypt",width=7,command=decrypt)
decrypt_button.grid(row=2,column=2,padx=0,pady=5)

root.mainloop()

结果：

msg: test
Encrypted ORZWK5A=
Decrypted test