重新创建一个句子并输出句子中的所有单词

Question

Develop a program that identifies individual words in a sentence, stores these in a list and replaces each word in the original sentence with the position of that word in the list. For example, the sentence

 MY NAME IS MY NAME IS MY NAME IS 

The sentence can be recreated from the positions of these words in this list using the sequence 1,2,3,1,2,3,1,2,3

This is what I have so far:

sentence = input("Please enter a sentence that you would like to recreate")
x = sentence.split()

positions = [0]

for count, i in enumerate(a):
    if x.count(i) < 2:
        positions.append(max(positions) + 1)
    else:
        positions.append(x.index(i) +1)

positions.remove(0)
print(positions)

This recreates the positions but what I need to do is output all the words that are in the sentence.

For example, if I wrote the sentence Leicester city are champions of the premier league the premier league is the best , I would want the program to output that the sentence contains the words Leicester, city, are, champions, of, the, premier, league, is, best .

Can somebody help me in this last bit?

Answer 1

Using the positions you generated, you can grab the parts of the list you want with a list comprehension or a simple for loop. The key here that while the numbers you are storing begin with 1 , python indices start at 0 . You can then use the join function of strings to print with commas.

sentence = "Leicester city are champions of the premier league the premier league is the best"
x = sentence.split()

positions = [0]

for count, i in enumerate(x):
    if x.count(i) < 2:
        positions.append(max(positions) + 1)
    else:
        positions.append(x.index(i) +1)


positions.remove(0)

reconstructed = [x[i - 1] for i in positions]
print(", ".join(reconstructed))

Alternatively, with a for loop:

reconstructed = []
for i in positions:
    reconstructed.append(x[i - 1])