PYTHON困惑为什么将值附加到字典的for循环不起作用

Question

I have a text file that includes

"Try not to become a man of success, but rather try to become a man of value. Look deep into nature, and then you will understand everything better. The true sign of intelligence is not knowledge but imagination. We cannot solve our problems with the same thinking we used when we created them. Weakness of attitude becomes weakness of character. You can't blame gravity for falling in love. The difference between stupidity and genius is that genius has its limits."

I am trying to put words as keys into a dictionary and have the line numbers they are in for the values.

Here is my code and I don't know why it doesn't work

dictionary = dict()
    i = 0
    for line in fp:
        for word in line.lower().split():
            if word in dictionary:
                dictionary[word].append(i)
            else:
                dictionary[word] = i
        i = i + 1

Answer 1

This is the correction:

else:
    dictionary[word] = [i]

Answer 2

The first time you insert a word as a key, its value has to be a list, not an integer, so that the next time you find the same word you can append to list. But you can't append to a int.

So here's the fixed code :

dictionary = dict()
i = 0
for line in fp:
    for word in line.lower().split():
        if word in dictionary:
            dictionary[word].append(i)
        else:
            dictionary[word] = [i]
    i = i + 1

---

A cleaner way to do it is to use a default dict with default value being a list.

from collections import defaultdict
dictionary = defaultdict(list)
for i,line in enumerate(fp):
    for word in line.lower().split():
            dictionary[word].append(i)

Answer 3

I think the general problem here is that a dictionary key have to be unique ... how many words you have in the sentence are repeated at least 2x?

list of repeated words: (try, not, to, become, a, man, of, but, and, you, the, is, we, weakness, genius)

then also words like "can't" will be split to "can" and "t" (do you want to handle t as not?)

Example of what you are asking for: having 2x key:value pair of 'try': 1