Python搜索文本文件和替换

Question

I want to take a list of words from textfile1.txt and replace the word "example" on textfile2.txt to whatever the text is on line one, line two and so on.. How would I do this?

Text file textfile1.txt

user1
user2
user3
user4
user5

Text file textfile2.txt

url/example
url/example
url/example
url/example
url/example

What I have so far

#!/usr/bin/env python3
import fileinput

with fileinput.FileInput("textfile2.txt", inplace=True ) as file:
    for line in file:
        print(line.replace("example", "user1"), end='')

My goal:

url/user1
url/user2
url/user3

Answer 1

This should do it. In general, when you want to traverse 2 or more iterables (lists, files, etc) in parallel, odds are you can use zip .

with open('textfile1.txt') as f1, open('textfile2.txt') as f2:
    for l, r in zip(f1, f2):
        print(r[:r.find('/')+1] + l)

Answer 2

I would open the first file and read each line into an array: ['user1', 'user2', ...]

Then, as you read the 2nd file, keep track of your line number. Index into the array based on the line number and use that string as your replacement string.

Or use the zip() answer, which is also fine.