Python Dictionary

# How to create a dictionary of countries in America and their capitals?
america = {'Country': 'Capital', 'Canada': 'Ottawa', 'Mexico':'Ciudad de México', 'United States':'Washington, D.C'}

# Print countries in America and their capitals 
print(america)

{'Country': 'Capital', 'Canada': 'Ottawa', 'Mexico': 'Ciudad de México', 'United States': 'Washington, D.C'}

# How to get the capital of Mexico? 
#  use the keys inside a [] instedd of the index as in lists and tuples
#  the countries are the keys while the capitals are the values
print(america['Country'])
print(america['Mexico'])

Capital
Ciudad de México

# How to get the capital of Mexico? We can also use .get()
print(america.get('Country'))
print(america.get('Mexico'))

Capital
Ciudad de México

# How to know the keys in a dictionary?
print(america.keys())

dict_keys(['Country', 'Canada', 'Mexico', 'Brazil'])

# How to know the values in a dictionary?
print(america.values())

dict_values(['Capital', 'Toronto', 'Ciudad de México', 'Brasília'])

# How to know the items in a dictionary?
print(america.items())

dict_items([('Country', 'Capital'), ('Canada', 'Toronto'), ('Mexico', 'Ciudad de México'), ('Brazil', 'Brasília')])

# How many items (key-value pairs) are in a dictionary?
len(america)

4

# How to change the capital of Canada?
america['Canada'] = 'Toronto'
print(america)

{'Country': 'Capital', 'Canada': 'Toronto', 'Mexico': 'Ciudad de México', 'United States': 'Washington, D.C'}

# How to add Brazil and its capital to America?
america['Brazil'] = 'Brasília'
print(america)

{'Country': 'Capital', 'Canada': 'Toronto', 'Mexico': 'Ciudad de México', 'United States': 'Washington, D.C', 'Brazil': 'Brasília'}

# How to delete the United States from America?
del america['United States']
print(america)

{'Country': 'Capital', 'Canada': 'Toronto', 'Mexico': 'Ciudad de México', 'Brazil': 'Brasília'}