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Dictionaries

Dictionaries are likely the most used data type.  These store data in "key, value" pairs and like other data types, nested values of other types are also allowed.

# Use dictionaries to store related values of which you wish to lookup later

person = {"name": "jack", "age": 27, "phone number": "555-1234"}

# You can also format a different way that is easier to understand
person = {
  "name": "jack",
  "age": 27,
  "phone number": "555-1234",
}

print(person['name'])  # result "jack"
print(person['age'])  # result 27

# change a value like this
person['age'] = 28
print(person['age']) # result 28

# Add a key, value like this
person['gender'] = 'male'
print(person)  # result {"name": "jack", "age": 28, "phone number": "555-1234", "gender": "male"}

# *** Iteration ***
for k, v in person.items():  # .items() produces two results, the key and the value. In this example they are stored in "k" and "v"
  print(k, v)  # this places each key and value on a new line
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