python - Matching an input from a string of characters? -

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suppose have string -> (a,b,c,1,2,3)

the user pick character string, perhaps b?

pickcharacter=raw_input("pick character? ")

user inputs, 'b'

the code recognizes 'b' character within string , accepts input.

whereas if user inputs 'f', program reject input because character not within string.

how can determine if user picks 1 of following characters list?

string_list = strng.split(",") if pick in string_list:     print "yep" else:     print "nope"

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