Write a program to delete all duplicate letters in a string

Solution

def removeDuplicate(str): 
    s=set(str) 
    s="".join(s) 
    print("Without Order:",s) 
    t="" 
    for i in str: 
        if(i in t): 
            pass
        else: 
            t=t+i 
        print("With Order:",t) 
      
str="helloworld"
removeDuplicate(str)