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Dictionaries (1/2)

In previous tasks, we store characteristics and names they belong to a bit equivalent. I think you agree that it would be great if we could reach information for something by its name, not finding indexes. This problem can be solved by using dictionaries - one more data type in Python.

Dictionary can be represented as key:value. It's important that keys in the dictionary can't repeat, while values can. To create dictionary use {key1: value1, key2: value2, ...} or dict(key1: value1, key2: value2, ...). Keys must be immutable (number, string, tuple).

For example, let's create dictionary with our first three countries.

Country	Area	Population
USA	9629091	331002651
Canada	9984670	37742154
Germany	357114	83783942


              123
            
# create dictionary
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)}
print(countries_dict)

Please note, that I placed countries' characteristics inside the tuple, as we mentioned before it greatly fits when we have some object characteristics.

Now if I want to get, for example, information for Canada, I can simply use d[key] function.


              123
            
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)}
# information about Canada
print(countries_dict["Canada"])

Opgave

Swipe to start coding

Create a dictionary with keys - names of people and values - their respective age and height (as a tuple). Print information for Alex.

Name	Age	Height
Alex	23	178
Noah	34	189
Peter	29	175

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 5. Kapitel 7

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Dictionaries (1/2)

For example, let's create dictionary with our first three countries.

Country	Area	Population
USA	9629091	331002651
Canada	9984670	37742154
Germany	357114	83783942


              123
            
# create dictionary
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)}
print(countries_dict)

Please note, that I placed countries' characteristics inside the tuple, as we mentioned before it greatly fits when we have some object characteristics.

Now if I want to get, for example, information for Canada, I can simply use d[key] function.


              123
            
countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)}
# information about Canada
print(countries_dict["Canada"])

Opgave

Swipe to start coding

Create a dictionary with keys - names of people and values - their respective age and height (as a tuple). Print information for Alex.

Name	Age	Height
Alex	23	178
Noah	34	189
Peter	29	175

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 5. Kapitel 7

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder