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Multithreading
Truman
Minister of Silly Walks
Posts: 404
Threads: 94
Joined: Dec 2017
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#1
Feb-10-2019, 01:55 AM
This script is supposed to download images in multithreading processes.
#! python3
# multidx.py - Downloads XKCD comics using multiple threads.

import requests, os, bs4, threading

os.makedirs('xkcd', exist_ok=True)   # store comics in ./xkcd

def downloadXkcd(startComic, endComic):
	for urlNumber in range(startComic, endComic + 1):
		print(f'Downloading page http://xkcd.com/{urlNumber}...')
		res = requests.get(f'http://xkcd.com/{urlNumber}')
		res.raise_for_status()
		soup = bs4.BeautifulSoup(res.text)
		comicElem = soup.select('#comic img')
		if comicElem == []:
			print('Could not find comic image.')
		else:
			comicUrl = comicElem[0].get('src')
			print(f'Downloading image {comicUrl}')
			res = requests.get(comicUrl)
			res.raise_for_status()
			imageFile = open(os.path.join('xkcd', os.path.basename(comicUrl)), 'wb')
			for chunk in res.iter_content(100000):
				imageFile.write(chunk)
			imageFile.close()
			
downloadThreads = []             # a list of all Thread objects
for i in range(0, 1400, 100):    # loops 14 times, creates 14 threads
	downloadThread = threading.Thread(target=downloadXkcd, args(i, i + 99))
	downloadThreads.append(downloadThread)
	downloadThread.start()

# Wait for all threads to end
for downloadThread in downloadThreads:
	downloadThread.join()
print('Done.')
but I receive an error
Error:
C:\Python36\kodovi>multidx.py
  File "C:\Python36\kodovi\multidx.py", line 29
    downloadThread = threading.Thread(target=downloadXkcd, args(i, i + 99))
                                                          ^
SyntaxError: positional argument follows keyword argument
I thought that the keyword argument goes first and then positional.

Also, I would appreciate if anyone could explain me the last chunk of code. Why calling a Thread object’s join() method will block until that thread has finished? The assumption is that there’s some code you don’t want to run in the main thread until all the threads have completed.
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stullis
Minister of Silly Walks
Posts: 443
Threads: 1
Joined: Sep 2018
Reputation: 62
#2
Feb-10-2019, 02:57 AM
For function arguments, the order always positional args, keyword args, and keyword-only args. The reason for this is that keyword arguments can be assigned as position arguments.

def test(var1=0, var2=0):
	return var1 + var2

test(4, 5) # Returns 9
In order to do that, the order of the keyword arguments must be maintained as long as positional arguments are provided. If we were to do test(var2=3, 4), the interpreter would be attempting to assign var2 twice which means that var1 isn't assigned. In this case, that wouldn't be the end of the world since var1 has a default value, but if it were a positional argument, that would be a problem.

The Thread.join() method runs a loop that repeatedly checks the status of the active Thread object. If the Thread is still alive - meaning that its Thread.run() has not returned - then the loop continues. It does two primary things:

  1. By halting execution of the main thread, it prevents code which may be dependent on the tasks in the thread from running. If such code were to run, it would encounter errors.
  2. It also prevents the main thread from completing. If the main thread were to complete, the program would exit. The Threads would still be running as zombies in the because they are independent of the main thread. Halting the main thread enables you to get feedback on the status of the other Threads.
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scidam

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Posts: 817
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Joined: Mar 2018
Reputation: 111
#3
Feb-10-2019, 04:42 AM
At least, expected = in line 29: args = (i, i + 99)
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Truman
Minister of Silly Walks
Posts: 404
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#4
Feb-11-2019, 01:44 AM
after changing the line to downloadThread = threading.Thread(args=(i, i + 99), target=downloadXkcd) a looong message appears ( you don't have to bother with that if it causes you anxiety! ):
Error:
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/religions
.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/relig
ions.png?

Downloading image //imgs.xkcd.com/comics/facebook.png
Exception in thread Thread-4:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/facebook.
png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/facebo
ok.png?

Downloading image //imgs.xkcd.com/comics/beautiful_dream.png
Exception in thread Thread-9:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/beautiful
_dream.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics
/beautiful_dream.png?

Downloading image //imgs.xkcd.com/comics/1000_comics.png
Exception in thread Thread-11:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/1000_comi
cs.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/100
0_comics.png?
Downloading image //imgs.xkcd.com/comics/galilean_moons.png

Exception in thread Thread-14:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/galilean_
moons.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/
galilean_moons.png?

Downloading image //imgs.xkcd.com/comics/android_boyfriend.png
Exception in thread Thread-7:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/android_b
oyfriend.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comi
cs/android_boyfriend.png?

Downloading image //imgs.xkcd.com/comics/family_circus.jpg
Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/family_ci
rcus.jpg': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/f
amily_circus.jpg?

Downloading image //imgs.xkcd.com/comics/election.png
Exception in thread Thread-6:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/election.
png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/electi
on.png?

Downloading image //imgs.xkcd.com/comics/vows.png
Exception in thread Thread-12:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/vows.png'
: No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/vows.png?

Downloading image //imgs.xkcd.com/comics/complexion.png
Exception in thread Thread-8:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/complexio
n.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/comp
lexion.png?
Downloading image //imgs.xkcd.com/comics/important_life_lesson.png

Exception in thread Thread-5:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get(comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 383, in prepare_
url
    raise MissingSchema(error)
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/important
_life_lesson.png': No schema supplied. Perhaps you meant http:////imgs.xkcd.com/
comics/important_life_lesson.png?

Done.
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stullis
Minister of Silly Walks
Posts: 443
Threads: 1
Joined: Sep 2018
Reputation: 62
#5
Feb-11-2019, 04:32 AM
The important part of that traceback is:

Error:
requests.exceptions.MissingSchema: Invalid URL '//imgs.xkcd.com/comics/vows.png'
: No schema supplied. Perhaps you meant http:////imgs.xkcd.com/comics/vows.png?
In downloadXKCD(), you have 

comicUrl = comicElem[0].get('src')
print(f'Downloading image {comicUrl}')
res = requests.get(comicUrl)
and the traceback is indicating that comicUrl, which is passed into requests.get(), does not have a schema at the beginning. In HTML coding, it is good practice to use relative paths for URIs instead of absolute paths. As such, the beginning of the image URI is missing. You'll need to prepend "http://" to the beginning of the URI. This should work:

comicUrl = comicElem[0].get('src')
print(f'Downloading image {comicUrl}')
res = requests.get("http://" + comicUrl)
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Truman
Minister of Silly Walks
Posts: 404
Threads: 94
Joined: Dec 2017
Reputation: 1
#6
Feb-12-2019, 01:22 AM
Thank you, now I get
Error:
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/relig
ions.png': No host supplied
Downloading image //imgs.xkcd.com/comics/android_boyfriend.png

Exception in thread Thread-7:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/andro
id_boyfriend.png': No host supplied

Downloading image //imgs.xkcd.com/comics/beautiful_dream.png
Exception in thread Thread-9:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/beaut
iful_dream.png': No host supplied

Downloading image //imgs.xkcd.com/comics/important_life_lesson.png
Exception in thread Thread-5:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/impor
tant_life_lesson.png': No host supplied

Downloading image //imgs.xkcd.com/comics/facebook.png
Exception in thread Thread-4:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/faceb
ook.png': No host supplied

Downloading image //imgs.xkcd.com/comics/galilean_moons.png
Downloading image //imgs.xkcd.com/comics/authorization.png
Exception in thread Thread-14:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/galil
ean_moons.png': No host supplied

Exception in thread Thread-13:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/autho
rization.png': No host supplied

Downloading image //imgs.xkcd.com/comics/election.png
Exception in thread Thread-6:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/elect
ion.png': No host supplied

Downloading image //imgs.xkcd.com/comics/family_circus.jpg
Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/famil
y_circus.jpg': No host supplied

Downloading image //imgs.xkcd.com/comics/bill_nye.png
Downloading image //imgs.xkcd.com/comics/1000_comics.png
Exception in thread Thread-11:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/1000_
comics.png': No host supplied
Exception in thread Thread-3:
Traceback (most recent call last):
  File "C:\Python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "C:\Python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Python36\kodovi\multidx.py", line 20, in downloadXkcd
    res = requests.get("http://" + comicUrl)
  File "C:\Python36\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 498, in reques
t
    prep = self.prepare_request(req)
  File "C:\Python36\lib\site-packages\requests\sessions.py", line 441, in prepar
e_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Python36\lib\site-packages\requests\models.py", line 309, in prepare
    self.prepare_url(url, params)
  File "C:\Python36\lib\site-packages\requests\models.py", line 386, in prepare_
url
    raise InvalidURL("Invalid URL %r: No host supplied" % url)
requests.exceptions.InvalidURL: Invalid URL 'http:////imgs.xkcd.com/comics/bill_
nye.png': No host supplied


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