Write a function named count_letters that takes as a parameter a string and returns a dictionary that tabulates how many of each letter is in that string. The string can contain characters other than letters, but only the letters should be counted. The string could even be the empty string (just ""). Lower-case and upper-case versions of a letter should be part of the same count. The keys of the dictionary should be upper-case letters. If a letter does not appear in the string, then it would not get added to the dictionary. For example, if the string is

Write a function named count_letters that takes as a parameter a string and returns a dictionary that tabulates how many of each letter is in that string. The string can contain characters other than letters, but only the letters should be counted. The string could even be the empty string (just ""). Lower-case and upper-case versions of a letter should be part of the same count. The keys of the dictionary should be upper-case letters. If a letter does not appear in the string, then it would not get added to the dictionary. For example, if the string is

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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In python and can't use isalpha() function.

Please use comments to explain code

Write a function named count_letters that takes as a parameter a string and returns a dictionary that tabulates how many of
each letter is in that string. The string can contain characters other than letters, but only the letters should be counted. The
string could even be the empty string (just ""). Lower-case and upper-case versions of a letter should be part of the same
count. The keys of the dictionary should be upper-case letters. If a letter does not appear in the string, then it would not get
added to the dictionary. For example, if the string is
"AaBb"
then the dictionary that is returned should contain these key-value pairs:
{'A': 2, 'B': 2}
And no, we haven't covered the isalpha() funciton, so don't use it.
The file must be named: count_letters.py

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