Python for Informatics Exercise 8.4: Using a single For loop

# empty word list created
wrd_list = []

filename = raw_input("Enter file name: ")

for line in  open(filename):
    wrd_list.extend(line.split())

# used set built-in function to remove repeated string
wrd_set = set(wrd_list)

# converted the set back to list using the list built-in function
wrd_list = list(wrd_set)

wrd_list.sort() # sorting was done
print wrd_list  # bingo!