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f = open('scarlet.txt', 'r')txt = f.read()# now txt is one long string containing all the charactersx = {
   } # start with an empty dictionaryfor c in txt:    if c not in x:        # we have not seen this character before, so initialize a counter for it        x[c] = 0    #whether we've seen it before or not, increment its counter    x[c] = x[c] + 1print("t: " + str(x['t']) + " occurrences")print("s: " + str(x['s']) + " occurrences")

题目：Provided is a string saved to the variable name sentence. Split the string into a list of words, then create a dictionary that contains each word and the number of times it occurs. Save this dictionary to the variable name word_counts.

sentence = "The dog chased the rabbit into the forest but the rabbit was too quick."words = sentence.split()word_counts = dict()for word in words:    if word not in word_counts:        word_counts[word] = 0    word_counts[word] = word_counts[word] +1print(word_counts)

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