"""
simple encryption algorithm for a text file.
"""

def encrypt( unencrypted_file , replace_file ):

# Encryption Process :

# difine a dictionary
dict = {}

# open replace.txt to fill dict and specifies replacement for every letter
with open(replace_file, 'r') as file_open:
   for line in file_open:
         dict[line[0]] = line[2]

# open unencrypted to read file
with open(unencrypted_file, 'r') as unencrypted_file_read:
   # create file to write to
   with open("encrypted.txt", 'w') as encrypted_file_write:

         for line in unencrypted_file_read:

            # new line encrypted
            new_line_cipher = ""

            # encode characters in line
            for c in line:

               if c in dict:
                     new_line_cipher += dict[c]
               else:
                     new_line_cipher += c

            # write encrypted line to file
            encrypted_file_write.write(new_line_cipher)

def decrypt( encrypted_file , replace_file ):

# Decryption Process

# difine a dictionary
dict = {}

# open replace.txt to fill dict and specifies replacement for every letter
with open(replace_file, 'r') as file_open:
   for line in file_open:
         # note i replac [2] with [0] Unlike encryption
         # we reverse the mapping
         dict[line[2]] = line[0]

# open unencrypted to read file
with open(encrypted_file, 'r') as encrypted_file_read:
   # create file to write to
   with open("unencrypted.txt", 'w') as unencrypted_file_write:

         for line in encrypted_file_read:

            # new line encrypted
            new_line_plain

Encrypt In this assignment, you will get practice with files by im...