列表 Python 的索引

Question

I am trying to find how to print the indexes of words in a list in Python. If the sentence is "Hello world world hello name") I want it to print the list "1, 2, 2, 1, 3")

I removed all duplicates of words with this:

sentence = input("Enter").lower()
words = sentence.split()
counts = []
for word in words:
    if word not in counts:
       counts.append(word)
print(counts)

But I need to still get indexes of the sentence using an array

Answer 1

If you want the index to be the "nth unique word I see in the sentence" then this code would produce this:

sentence = "Hello world world hello name".lower()
first_occurence = dict()
for pos, word in enumerate(sentence.split(" ")):
    if word not in first_occurence:
        first_occurence[word] = len(first_occurence)

res = [first_occurence[word] + 1 for word in sentence.split(' ')]

result: [1, 2, 2, 1, 3]