Given a string, write a function “recurring char” to find the strings first recurring character. Return “None” if there is no recurring character.

Note: Treat upper and lower case letters as distinct characters. You may assume the input string includes no spaces.
Example:
input = "interviewquery"
output = "i"

input = "interv"
output = "None"

Question

Given a string, write a function “recurring char” to find the strings first recurring character. Return “None” if there is no recurring character.

Note: Treat upper and lower case letters as distinct characters. You may assume the input string includes no spaces. 
Example:
input = "interviewquery"
output = "i"

input = "interv"
output = "None"

Anon · Accepted Answer

def rec_char(input):
    sett = set()
    for i in input:
        if i not in sett:
            sett.add(i)
        else:
            return i
    return "None"

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