num_key_alpha_freq_cipher_full

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Filename: num_key_alpha_freq_cipher_full.py


"""
This script automatically encodes and decodes a user input string using a letter frequency & a BASE-7 cipher.

[Encode Path]
User Input --> Letter Freequency --> Numerical Key
User Input --> ASCII --> BASE-7 --> Display Encoded Key

[Decode Path]
Numerical Key --> Encoded BASE-7 Key --> Encoded ASCII --> DECODED

Example Output:
Enter your string: hello world!

User Input:             hello world!

                        abcdefghijklmnopqrstuvwxyz
                        --------------------------
Numerical Key:          00011001000300200100001000

Encoded BASE-7 Key:     111264533620221435234501460
Encoded ASCII:          206 203 213 213 216 44 230 216 222 213 202 45

Decoded Numerical Key:  11001000300200100001000
Decoded In Plain Text:  hello world!
"""

def base_7_encoder(num_key):
    if num_key == 0:
        return '0'

    result = ''
    while num_key > 0:
        remainder = num_key % 7
        result = str(remainder) + result
        num_key //= 7

    return result

def base_7_decoder(base_7_key):
    num_key = 0
    for digit in base_7_key:
        num_key = num_key * 7 + int(digit)
    return num_key

def text_to_base_7(text):
    base_7_result = ''
    for char in text:
        char_value = ord(char)
        base_7_result += base_7_encoder(char_value) + ' '

    return base_7_result.strip()

def base_7_text_decoder(base_7_text):
    decoded_text = ''
    for base_7_digit in base_7_text.split():
        char_value = base_7_decoder(base_7_digit)
        decoded_text += chr(char_value)
    return decoded_text

# Global Variable Alphabet
alphabet = 'abcdefghijklmnopqrstuvwxyz'

def count_letters(input_string):
    letter_count = {char: 0 for char in alphabet}

    for char in input_string:
        if char.isalpha():
            letter_count[char.lower()] += 1

    count_string = ''.join(str(letter_count[char]) for char in alphabet)
    return count_string

# Get User Input
user_input = input("Enter your string: ")
num_key = count_letters(user_input)

# Convert numerical key to base-7
base_7_encoded_key = base_7_encoder(int(num_key, 10))

# Convert text to base-7
base_7_encoded_text = text_to_base_7(user_input)

# Output Results
print('\nUser Input:            ', user_input, '\n')
print('\t\t\t' + alphabet, '\n\t\t\t--------------------------')
print('Numerical Key:         ', num_key)
print('\nEncoded BASE-7 Key:    ', base_7_encoded_key)
print('Encoded ASCII:         ', base_7_encoded_text)

# Decode base-7 key
decoded_num_key = base_7_decoder(base_7_encoded_key)

# Decode base-7 text
decoded_text = base_7_text_decoder(base_7_encoded_text)

# Output Decoded Results
print('\nDecoded Numerical Key: ', decoded_num_key)
print('Decoded In Plain Text: ', decoded_text)