Python: Replacing a keyword with values ​​from a list in order?

Question

Python

Hello.
There is a text file with a keyword. It looks something like this:
Sometext
Keyword
More sometext
Keyword
etc
There is also a list (another text file) from which I want to get keyword substitutions. The keyword is the same, the values ​​for the replacement are all different.
List view with replacements:
[attachmentid=1923106]
[attachmentid=1923108]
[attachmentid=1923110]
[attachmentid=1923112]
[attachmentid=1923114]
and so on.
I compiled the following Python script (version 3.5.1):

list = []
with open('d:/attachment.txt','r') as inf:
   list = inf.read()
file = open('d:/new_1.txt', 'r')
text = file.read()
num_of_words = text.count('Image')
for i in range(0, num_of_words):
    text = text.replace('Image', list, 1)
file.close()
file = open('d:/new_1.txt', 'w')
file.write(text)
file.close()

attachment.txt - storage for the list of replacements (attachmentid), new_1.txt - file where the replacement is made.
This code substitutes the entire list for each occurrence of the keyword. I would like the first occurrence of the keyword to be the first item of the list, for the second - the second, and so on:
Sometext
Keyword = [attachmentid=1923106]
More sometext
Keyword = [attachmentid=1923108]
etc
Please tell me how to fix this .
PS I don't know Python just a little less than at all. The code was compiled using Google and answers from StackOverflow.

Answer 1

In the line
You need to add an index - so that at each step only the element with this index is substituted, and not the whole list:
But this will work fine only if the number of replacement lines is guaranteed not less than the number of places to replace. Otherwise, you will get an error.