Commands used in the Egghead.io Series Intro to Python

Lesson Fifteen - Manipulate Data with Dictionaries in Python

Create a dictionary and add values to it in Python:

age = {}
age['will'] = 40
age['bob'] = 30
age['john'] = 20
age # returns {'will': 40, 'bob': 30, 'john': 20}

Access the value for a specific key in the dictionary:

print(age['will']) # returns 40

Check to see if a key is present in the dictionary:

'will' in age # returns True
'austin' in age # returns False

Delete a key/value pair from a dictionary:

del age['bob']

Use the get method to retrieve a value or a default value if not found:

print(age.get('will', 'Key not found')) # returns 40
print(age.get('austin', 'Key not found')) # returns Key not found

Iterate the key value pairs in a dictionary:

for key, value in age.items():
    print(key, value)