String indexing and concatenation
You are presented with one of the earliest known encryption techniques - Caesar cipher. It is based on a simple shift of each letter in a message by a certain number of positions down the given alphabet. For example, given the English alphabet, a shift of 1 for 'xyz' would imply 'yza' and vice versa in case of decryption. Notice that 'z' becomes 'a' in this case.
Thus, encryption/decryption requires two arguments: text and an integer key denoting the shift (key = 1 for the example above).
Your task is to create an encryption function given the English alphabet stored in the alphabet string.
This exercise is part of the course
Practicing Coding Interview Questions in Python
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
def encrypt(text, key):
encrypted_text = ''
# Fill in the blanks to create an encrypted text
for char in text.lower():
idx = (alphabet.____(____) + ____) % len(____)
encrypted_text = encrypted_text + alphabet[idx]
return encrypted_text
# Check the encryption function with the shift equals to 10
print(____("datacamp", ____))