dictionaries tutorial for GSMST number theory

dictionaries.py

# let's say we want to keep track of a person.
# me.

daniel = {
    'fname': 'Daniel',
    'lname': 'Connelly',
    'age': 25,
    'city': 'Atlanta'
}

print daniel

# get the data from "daniel" labeled "age":
print 'Daniel\'s age is', daniel['age']

# this is called a "dictionary", "map", "hashes", etc.
# or "dict" for short

# what if we want to add another field later?

daniel['hair'] = 'balding'
print daniel

# terminology: called dictionaries
# the "accessors" or "indices" are called "keys"
# so the keys of daniel are 'fname', 'lname', 'age', 'city', 'hair'
# the values are called values.

# let's say I move to California
daniel['city'] = 'San Francisco' # reassigns the value for 'city' to ...
print daniel

# what if we want to delete stuff from the dictionary?
del daniel['age']
print daniel

# what if we just want to know what keys are in the dictionary?
print sorted(daniel.keys())

# what if we just want the values?
print daniel.values()