Write a function that reads the words in words.txt and stores them as keys in a dictionary. It doesn’t matter what the values are. Then you can use the in operator as a fast way to check whether a string is in the dictionary.
'''
f1=open('words.txt')
d1=dict()
i=0
for line in f1:
words=line.split()
for i in range(len(words)):
d1[words[i]]=i
print d1
print 'abc' in d1
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