dicts

# dictionaries are hash tables, key:value pairs
dct = {
    "Adam": ["adam@email.com", 2445055],
    "Bard": "bard@email.com"
}

print(dct)
# {'Adam': ['adam@email.com', 2445055], 'Bard': 'bard@email.com'}
print(dct["Adam"])
# ['adam@email.com', 2445055]
print(dct["Adam"][1])
# 2445055

# update value
dct["Bard"] = "bard@anotheremail.com"
print(dct)
# {'Adam': ['adam@email.com', 2445055], 'Bard': 'bard@anotheremail.com'}

# add key:value pair
dct["Cole"] = "cole@email.com"
print(dct)
# {'Adam': ['adam@email.com', 2445055], 'Bard': 'bard@anotheremail.com', 'Cole': 'cole@email.com'}

# remove key:value pair
del dct["Cole"]

print("Cole" in dct)
# False
print("Adam" in dct)
# True

# create dictionary from a list of tuples
dct_list_tuples = dict([(1, "x"), (2, "y"), (3, "z")])
print(dct_list_tuples)
# {1: 'x', 2: 'y', 3: 'z'}