Python has 4 basic inbuilt data structures: Lists, Tuples, Sets, and Dictionaries.
Lists, tuples, and sets are used to keep single elements in collections. Dictionaries, on the other hand, are used to keep key-value pairs. Similar to real-world dictionaries, where each word corresponds to its translation or explanation, Python dictionaries use keys to map them to their corresponding values. We can keep a dictionary of countries and their capitals:
capitals = {
	'Armenia': 'Yerevan',
	'Australia': 'Canberra',
	'Austria': 'Vienna',
	'Brazil': 'Brasilia',
	'United States': 'Washington D.C.',
# {'Armenia': 'Yerevan', 'Australia': 'Canberra', 'Austria': 'Vienna', 'Brazil': 'Brasilia', 'United States': 'Washington D.C.'}
To define a dictionary, we first open a curly bracket {, then put each key on the left side of the colon :, and the value on the right side. Each key-value pair is separated by a comma, and the dictionary definition ends with a closing curly bracket }.
Both keys and values can be of different types. We can keep the city population in a dictionary:
population = {
	'Yerevan': '1M',
	'Canberra': 395790,
	'Vienna': '1.897 million',
	'Brasilia': 4804000,
	'Washington D.C.': 692683,
# {'Yerevan': '1M', 'Canberra': 395790, 'Vienna': '1.897 million', 'Brasilia': 4804000, 'Washington D.C.': 692683}
In the case of lists and tuples, we could access the individual elements by their index [2]. When working with dictionaries, the access to elements is done through keys:
print(population['Yerevan'])    # 1M
print(population['Brasilia'])   # 4804000
print(population['New York'])   # KeyError: 'New York'
print(population[0])            # KeyError: 0
If the key does not exist in the dictionary, Python raises an error telling that the key is not in the dictionary.


Google translate is great but can you create a simpler version of it?
You are helping your friend to study the French class. He is an English speaker, so you want to write a program for him that given an English word or a phrase would print the corresponding phrase in French. Below are the phrases that he’s currently studying:
Thank you
How are you?
Comment ca va?
Hello everyone
Bonjour à tous
This is delicious
C'est délicieux
Note: Don’t use if/else statements. It’s much shorter and easier to do this with dictionaries.
The input contains a single line - the phrase in English.
The program should print the corresponding French sentence.
How are you?
Comment ca va?
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