Make AnimePlanet.py more PEP8 compliant

[reillysiemens]

PEP8 compliance (according to flake8) before and after the changes in this PR. This is part of addressing #16.

(roboragi) [0:36:22] tucker@khanti:~/Projects/Roboragi git:(master) $ flake8 roboragi/AnimePlanet.py
roboragi/AnimePlanet.py:34:80: E501 line too long (98 > 79 characters)
roboragi/AnimePlanet.py:46:80: E501 line too long (90 > 79 characters)
roboragi/AnimePlanet.py:57:80: E501 line too long (118 > 79 characters)
roboragi/AnimePlanet.py:60:80: E501 line too long (120 > 79 characters)
roboragi/AnimePlanet.py:69:80: E501 line too long (87 > 79 characters)
roboragi/AnimePlanet.py:74:5: E722 do not use bare except'
roboragi/AnimePlanet.py:79:80: E501 line too long (178 > 79 characters)
roboragi/AnimePlanet.py:82:80: E501 line too long (98 > 79 characters)
roboragi/AnimePlanet.py:95:80: E501 line too long (90 > 79 characters)
roboragi/AnimePlanet.py:106:80: E501 line too long (118 > 79 characters)
roboragi/AnimePlanet.py:109:80: E501 line too long (120 > 79 characters)
roboragi/AnimePlanet.py:118:80: E501 line too long (87 > 79 characters)
roboragi/AnimePlanet.py:123:5: E722 do not use bare except'
(roboragi) [0:36:25] tucker@khanti:~/Projects/Roboragi git:(master) $ git co pep8-anime-planet 
Switched to branch 'pep8-anime-planet'
(roboragi) [0:36:39] tucker@khanti:~/Projects/Roboragi git:(pep8-anime-planet) $ flake8 roboragi/AnimePlanet.py
(roboragi) [0:36:43] tucker@khanti:~/Projects/Roboragi git:(pep8-anime-planet) $

While I was in here I also made the URL generation a little safer and cleaner using urljoin and quote. This demonstrates that URL generation should still work the same in Python 2 and Python 3.

# url_example.py
from sys import version_info

PY2 = version_info.major == 2

BASE_URL = 'https://www.anime-planet.com'

if PY2:
    from urllib import quote
    from urlparse import urljoin
else:
    from urllib.parse import quote, urljoin

def url():
    return urljoin(BASE_URL, '/anime/all?name=' + quote('Hello World!'))

if __name__ == '__main__':
    print(url())

[0:47:29] tucker@khanti:/tmp/url-example $ [ $(python url_example.py) == $(python3 url_example.py) ] && echo "They're the same."
They're the same.
[0:47:30] tucker@khanti:/tmp/url-example $

For future PRs (or for this one, I guess) should I be concerned with writing Python 2/Python 3 compatible code, or can I safely write Python 3 only code?

[Nihilate]

Looks good. You can safely stick with purely supporting Python 3. It's currently running as 3.6.5, but I'm happy to upgrade if you're after some 3.7.0 features.

[reillysiemens]

Python 3.6.5 is plenty modern enough for most of the changes I've got in mind. Now that I know that's what's running under the hood I may take more advantage of those features (especially f-strings to keep strings shorter). There might be cause to take advantage of some of the 3.7.0 features (maybe data classes?) at a later date, but I don't think that's necessary now.

I'll probably also suggest the inclusion of type annotations where possible as the Great Roboragi Cleanup progresses. :grin:

[Nihilate]

For sure, that sounds like a good idea - I've created #52 to cover it off.