python django，如何禁止从for循环转到下一个代码

Question

def redirectTest(item):
    try:
        headers = {
            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36'
        }
        r = None
        try:
            r = requests.head(item, allow_redirects=False, headers=headers)
        except Exception as e:
            print(e)
        if r is not None:
            if r.status_code == 301:
                print("Tested: " + str(r.status_code))
            elif r.status_code == 302:
                print("Tested: " + str(r.status_code))
            else:
                print("Tested: " + str(r.status_code))
    except requests.exceptions.RequestException as e:
        print('error: ' + e)
    return

@ensure_csrf_cookie
def re_check_url(request):
    if request.method == "POST":
        if request.is_ajax():
            resolved_urls = ['twitch.tv/yumyumyu77']
            scheme_list = ['http://www.', 'http://', 'https://www.', 'https://']

            for item in resolved_urls:
                for scheme_item in scheme_list:
                    redirectTest(scheme_item + item)
            return JsonResponse({'res': 1})
        return JsonResponse({'res': 2})

This code checks scheme + some url 's responses.

But when I execute the code, my Django terminal prints:

 r_status_code: 301
 r_status_code: 301
 r_status_code: 200
[22/Oct/2018 23:54:49] "POST /re/check/url/ HTTP/1.1" 200 10
 r_status_code: 301

Problem:

I think it means that return JsonResponse({'res': 1}) this line is ahead, and print("Tested: " + str(r.status_code)) this line is after or later.

Sometimes it prints ordinarily, but sometimes it prints abnormally.

Question:

I learned that Python code is executed line by lines from top to bottom, but It seems like it is not doing so.

Why does this happened? and how can I fix it?

It's executing order is not what I expected.

Edit:

I tried to use Lock()

    for item in resolved_urls:
        for scheme_item in scheme_list:
            from threading import Lock
            _lock = Lock()
            with _lock:
                redirectTest(scheme_item + item)

But It does not seems to be working well.

Answer 1

Everything is actually working correctly. 200 is success, and it redirects to the success page. Then it runs your last loop.