simple encryption program

Text_encryption.py

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+#encryption programming
+
+import random
+import string
+
+chars = " " + string.punctuation + string.digits + string.ascii_letters
+chars=list(chars)
+key = chars.copy()
+
+random.shuffle(key)
+
+#print(chars)
+#print(key)
+
+#ENCRYPT
+
+plain_text = input("Enter a message to encrypt: ")
+cipher_text = ""
+
+for letter in plain_text:
+    index = chars.index(letter)
+    cipher_text += key[index]
+
+print(f"original message : {plain_text}")
+print(f"encrypted message : {cipher_text}")
+
+#decrypt 
+cipher_text = input("Enter a message to decrypt: ")
+plain_text = ""
+
+for letter in cipher_text:
+    index = key.index(letter)
+    plain_text += chars[index]
+
+print(f"encrypted message : {cipher_text}")
+print(f"original message : {plain_text}")
+
+
+