如何在Python中将变量打印到文本文件？

Question

Hello i am working on a project that prints extracted url to a text file....

I want a little help in my python program it's not working to write all the extracted url to the file whereas this writes the last url only to the file ......

def do_this():
    print url
    text_file = open("Output.txt", "w")
    text_file.write("Extracted URL : %s" % url)

while True:
    url, n = getURL(page)
    page = page[n:]
    if url:
        do_this()
    else:
        text_file.close()
        break

I can't find the solution !!

Sorry For Bad English.. Please Help !!

Answer 1

Use a to append, each time you open using w you overwrite, appending will append after any existing lines:

def do_this():
    print url
    text_file = open("Output.txt", "a")
    text_file.write("Purchase Amount: %s\n" % url)

It would probably make more sense to just open once moving the logic into the function, something like:

def do_this(page):
    with  open("Output.txt", "a") as f:
        while True:
            url, n = getURL(page)
            page = page[n:]
            if not url:
                break
            f.write("Extracted URL : %s\n" % url)

I also added a \\n to the write or all your data will be on a single line