Count Letters in a String | Dataford Interview Questions

Write a function that counts the letters of a string and records them.

Implement def count_letters(s):. Return a dictionary mapping each English letter to its case-insensitive frequency, ignoring spaces, punctuation, digits, and other nonletters. Preserve the order in which distinct letters first appear.

For example, "Swift!" returns {"s": 1, "w": 1, "i": 1, "f": 1, "t": 1}.

Constraints

0 <= len(s) <= 1000
s contains Unicode characters, including possible spaces, punctuation, and digits
Only English letters A-Z and a-z are counted
Matching letters are counted case-insensitively

Function Signature

def count_letters(s):

Your question is Count Letters in a String. Start with the requirements in the Question tab.

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Problem

Write a function that counts the letters of a string and records them.

For example, "Swift!" returns {"s": 1, "w": 1, "i": 1, "f": 1, "t": 1}.

Constraints

0 <= len(s) <= 1000
s contains Unicode characters, including possible spaces, punctuation, and digits
Only English letters A-Z and a-z are counted
Matching letters are counted case-insensitively

Function Signature

def count_letters(s):

Your question is Count Letters in a String. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.