[Tutor] Help!

[Jessica Poveda]

I need help writting a program.
1) Random string generation 
2) no repeating letters 
Can anyone help me,please? I am so confused. The only problem is I have to use the code that is written there but add on to it.  
 
import random

alphabet = "abcdefghijklmnopqrstuvwxyz"
myNewString = ""
for letters in alphabet:
    myNewString = myNewString + alphabet[random.randrange(26)]
    print myNewString 


      
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