[zdict.py] code refactoring and test cases

[iblislin]

It seams that there is some global vars. Could we avoid this? or is it a necessary evil?

And, i want to introduce this coding style:
https://en.wikibooks.org/wiki/Computer_Programming/Coding_Style/Minimize_nesting
Please comment

I will keep updating the working list here:

• reduce nesting
  • main()
  • MetaInteractivePrompt
• test case
  • main()
• Remove global vars
  • zdict.py
• Remove dependency of args (avoid just pass args from zdict.py)
  • DictBase.lookup

[fkztw]

I'm ok with this coding style.

I used global vars for args and dictionary_map because almost every function in zdict.py need these two vars.
If u don't want to use global, just pass these two vars as arguments to those functions which needed them.
I'm ok with that, I was too lazy to add these two arguments. lol

[iblislin]

Thanks for comment.

I will work on removing the global vars.

[iblislin]

@M157q global vars are really hard to remove.... The appear every where.. @wdv4758h suggests that we need to refactor the flow control of zdict.py

[fkztw]

• zdict/__main__.py
• zdict/dictionaries/moe.py
• zdict/dictionaries/spanish.py
• zdict/dictionaries/template.py
  • as a template for dictionaries unit testing
• zdict/dictionaries/urban.py
• zdict/dictionaries/yahoo.py
• zdict/dictionary.py
• zdict/easter_eggs.py
• zdict/exceptions.py
• zdict/utils.py
• zdict/zdict.py

[fkztw]

@iblis17 I'm thinking about just leaving this issue for refactoring only.
I'm going to create another issue for the unit-testings part.
So, you can make this issue turn into a PR base on issue-48 branch for code review.
What do you think?