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Exercise

Dictionaries

Dictionaries are similar to named vectors and lists in R in that they provide a name (or key) for you to access values. In Python, dictionaries are created using a pair of curly brackets, { }, and passed in key-value pairs. Keys and values are separated with a colon. For example to create a dictionary with the key, 'a' and a value of 1, you write: 

d = {'a': 1}

Multiple key-value pairs are separated by a comma. To access a value by the key, you can use square brackets (just like subsetting values from a list), but instead of passing in an index, you pass in the key: 

d = {'a': 1, 'b': 2}
print(d['a'])

1

person_list is printed in the IPython shell and is available in your workspace.

Instructions

100 XP
  • Create a dictionary form of person_list which is printed in the shell. Use the keys, fname, lname, sex, employed, and twitter_followers.
  • Extract and print the first and last names (specified by the keys fname and lname) from person_dict.