python 3 need to return true if duplicate letters are found need to return false if duplicate letters are found must be case sensitive everytime i input "hello" it returns false but when i enter "bibi" it returns  true so not sure where my code is wrong need it to return true when i input hello

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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python 3

need to return true if duplicate letters are found

need to return false if duplicate letters are found

must be case sensitive

everytime i input "hello" it returns false but when i enter "bibi" it returns  true so not sure where my code is wrong

need it to return true when i input hello

def duplicate_letters(word_input)
""'First for loop measures for duplicates and second one measures for non-duplicates."
-> int:
for a in range(len(word_input)):
if word_input.count (word_input [a]) > 1:
return True
else:
word_input.count(word_input [a]) != 1
return False
for a in range(len(word_input)):
if word_input.upper( [a]) == word_input([a]):
return False
print("Found duplicate:
+ str(duplicate_letters(word_input)))
Transcribed Image Text:def duplicate_letters(word_input) ""'First for loop measures for duplicates and second one measures for non-duplicates." -> int: for a in range(len(word_input)): if word_input.count (word_input [a]) > 1: return True else: word_input.count(word_input [a]) != 1 return False for a in range(len(word_input)): if word_input.upper( [a]) == word_input([a]): return False print("Found duplicate: + str(duplicate_letters(word_input)))
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