Contenido del Curso

Learn Python from Scratch

1. The basics

Hello, World!Hello, me!Variables Comments Indentation Numbers and strings

2. Arithmetic operations

Addition Multiplication and power Division and whole part division

3. Common data types

Data types Numbers float and int Storing text Strings slicing Concatenation

4. Conditional statements

Boolean data type Combining conditions Simple if/else expressions (1/2)Simple if/else expressions (2/2)If/else expressions with multiple conditions (1/2)If/else expressions with multiple conditions (2/2)

5. Other data types

Lists (1/3)Lists (2/3)Lists (3/3)Tuples (1/3)Tuples (2/3)Tuples (3/3)Dictionaries (1/2)Dictionaries (2/2)

6. Loops

while loop (1/2)while loop (2/2)for loop (1/5)for loop (2/5)for loop (3/5)for loop (4/5)for loop (5/5)

7. Functions

Built-in functions Writing your own functions (1/5)Writing your own functions (2/5)Writing your own functions (3/5)Writing your own functions (4/5)Writing your own functions (5/5)lambda functions

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"])

Tarea

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

Tarea

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

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

¿Todo estuvo claro?

Sección 5. Capítulo 7

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"])

Tarea

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

Tarea

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

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

¿Todo estuvo claro?

Sección 5. Capítulo 7

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"])

Tarea

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

Tarea

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

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

¿Todo estuvo claro?

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"])

Tarea

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

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

Sección 5. Capítulo 7

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones