Answered: Finish filling out the following Python…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Finish filling out the following Python code

'''
Goal: implement a caesar substitution cipher
where the key is an integer from 1 - 25
'''
def caesar(txt, key):
out_str = ''
# force key to be in range
key = key % 26
alpha = 'abcdefghijklmnopqrstuvwxyz'
alpha2 = alpha + alpha
for c in txt:
'''
fill in
'''
return out_str

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Can you explain the lines:

out_str += chr((ord(c) + key-97) + 97)
else:
out_str+= chr((ord(c) + key - 65) + 65)

Specifically, why you use the numbers 97 and 65.

Also - what is included in the parameter "txt"? Is it the same as the "text" variable?

Thank you- I'm still very much a beginner (obviously)

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