Python sets a value change statement, why doesn't it work?

Question

I want to set some data in the file to the original value, and set the missing value to 0, but the final result is all 0, what is wrong with the code?
Original data picture description
Processing results image description

#!/usr/bin/python
#coding:utf-8
train_data = {}
input_data = open("train_tfidf.txt", "r").readlines()
output_data = open("single_tfidf.txt", "w")
for line in input_data:
    temp_dict = {}
    for i in range(60304):
        temp_dict[i] = 0
    datas = line.split()
    for ele in datas:
        try:
            word_index = ele.split(":")[0]
            tfidf = ele.split(":")[1]
            if word_index == i:
                temp_dict[i] = tfidf
        except:
            continue
    # print temp_dict
    # print word_index, tfidf
    output_data.write(str(temp_dict))
    output_data.write('\n')

  [1]: /img/bVPJMi
  [2]: /img/bVPJMV

Answer 1

Since you traverse datas after running range(), and since range() is an iterative function, when running the for loop of datas, the value of i is always 60303 , so the condition of if word_index == i is not satisfied, so except for the 60303 item, the others are still initial values. In fact, it is recommended to change it like this

if word_index == i:
    temp_dict[i] = tfidf

Here you can directly determine whether temp_dict[word_index] exists as 0. If it is not defined, it should be None, so this block is changed to

if temp_dict[word_index] == 0:
    temp_dict[word_index] = tfidf