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Python while loop verification code problem?
import random
listData = ['A','B','C','D','E','F','G','H' ,'I','J','K','L','M','N','O','P','Q','R','S','T',' U','V','W','X','Y','Z','a','b','c','d','e','f','g' ,'h','i','j','k','l','m','n','o','p','q','r','s',' t','u','v','w','x','y','z','1','2','3','4','5','6' ,'7','8','9','0']
print(''.join(random.sample(listData, 4)))
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