I have to write this code where The function must receive a path to a text file which must contain text composed of only English letters and punctuation symbols and a destination file for encrypted data. Punctuation symbols must be left as they are without any modification and the encrypted text must be written to a different file. Also, I have to validate the inputs.
I've done most of it but in the first part, where I have to ask for a text, the code isn't accepting spaces or punctuation marks, and as I gather it's because of .isalpha, however I couldn't find a way to fix it.
I'm not sure if I have completed the aforementioned requirements, so any type of feedback / constructive criticism is appreciated.
while True: # Validating input text
string = input("Enter the text to be encrypted: ")
if not string.isalpha():
print("Please enter a valid text")
continue
else:
break
while True: # Validating input key
key = input("Enter the key: ")
try:
key = int(key)
except ValueError:
print("Please enter a valid key: ")
continue
break
def caesarcipher(string, key): # Caesar Cipher
encrypted_string = []
new_key = key % 26
for letter in string:
encrypted_string.append(getnewletter(letter, new_key))
return ''.join(encrypted_string)
def getnewletter(letter, key):
new_letter = ord(letter) + key
return chr(new_letter) if new_letter <= 122 else chr(96 + new_letter % 122)
with open('Caesar.txt', 'a') as the_file: # Writing to a text file
the_file.write(caesarcipher(string, key))
print(caesarcipher(string, key))
print('Your text has been encrypted via Caesar-Cipher, the result is in Caesar.txt')
Well, you could check it "manualy".
# ____help_function____
def check_alpha(m_string):
list_wanted = ['!', '?', '.', ',']
for letter in m_string:
if not (letter in list_wanted or letter.isalpha()):
return False
return True
# ____in your code____
while True:
string = input("Enter the text to be encrypted: ")
if check_aplha(string):
break
else:
print('....')