Learned about key arguments
	* it comes useful especially that key
      arguments have a default value

[#54145919]
Learned about Hashes

  * I still have to figure out
    test_default_value_is_the_same_object
  * I wish it had more nested hashes

[#54145901]
Approved by Jason
Merge branch '54145901_about_hashes_master'
Approved by Jason
Merge branch '54145919_about_keyword_arguments_master'