dictionaries.py

# Data is stored in a dictionary as key-values pairs
my_dict = { 
  "bob": "bob1991@gmail.com",
  "claire": "claire1986@gmail.com",
  "john": "john_22@gmail.com"
}

# You can initialize an empty dictionary in 2 ways
my_dict = {}
my_dict = dict()

# You access the values inside via the key
my_dict["claire"] # Outputs "claire1986@gmail.com"

# Add items to your dictionary like so
my_dict = dict()
my_dict["bob"] = "bob1991@gmail.com"
my_dict["claire"] = "claire1986@gmail.com"
my_dict["john"] = "john_22@gmail.com"

# We can also loop through the keys and values
# The following code prints each key and value of my_dict
for key, value in dictionamy_dictry.items():
  print("key: {0}, value:{1}".format(key, value))
  
# If you want to delete an item from a dictionary, be sure
# to do it OUTSIDE of a loop. Dictionaries can't be modified 
# inside a loop, it's Python law
del my_dict["john"]

# Get a list of all the keys or values in the dictionary
my_dict.keys()
my_dict.values()