Apuntes de Python (inglés)

Introducción a Pyhton

• It´s the language of choice* for many companies and a popular pick for personal projects. You can use it for automating tasks**, getting ahead in work with data analysis, machine learning, and much more. *Elección, **tareas/proyectos.
• No matter how complex a program is, it begins with a single line of code. This first line is usually a variable.
• Programs use variables to remember information. Like moving boxes, variables have content and names that tell us what´s inside.

Creating Variables

• To create a variable, we need to give it a name. Variable names need to be single words and, therefore, have no spaces. Tap the variable name city to get started.
• If we want a variable name with multiple words, we used snake case. Snake case means using _ to connect the additional words: home_city
• What do we use snake case for? To create variable names with multiple words.
• After creating and naming a variable, we use the = sign to store a value inside it, like with city = “Miami” 
• What´s the value of this variable? name=”Karin”. The value is “Karin”.
• How do we know a value is a string*? It´s a Word between double quotes. *Cuerda/cadena.
• Lines of code are instructions for the computer to fllow. When we run code, we tell the computer to follow the instructions we put together*. *Reunimos.
• The order of the instructions matters because the computer follows the instructions line by line. Arrange these lines of code in the correct order, beginning with step_1, followed by step_2, and finally step_3.
• With the special instruction print( ), we tell the computer to display* a value in an area called the console, also known as the shell. *muestre print(“Hello, world!”): Hello, World!
• We can use the print( ) instruction as often* as we want. The computer displays every value on a line in the console. * Tan amenudo

• We can use print( ) to display variables like greeting*, too. *Como un saludo

Script.py

greeting = “Hello, World!”

print(greeting)

Output

Hello, World!

• When we display variables in the console, their values appear instead of their names. If we print name here, it´ll show its value.

Script.py

name = “Daenerys”

print(name)

Output

Daenerys

• How do we know “Hello, World!” is a string? It starts and ends with double quotes.
• What does this code display in the console? B-ball.

Script.py

sport = “B-ball”

print(sport)

Output

B-ball

• Display the value daily in the console

Script.py

frequency = “daily”

print(frequency)

Output

Daily

• Add the symbols to display this string value in the console.

Script.py

print(“Buzz”)

Output

Buzz

• Display the value of last_name.

Script.py

last_name = “Lightyear”

print(last_name)

Output

Lightyear

• Display the value of the job variable.

Script.py

job = “Sheriff”

print(job)

Output

Sheriff

Using Variables

• Variables are called variables because the values they store can change. We can update status by using = and giving it a new value.

Script.py

status = “Watching Netflix”

status = “Releaxing at the beach”

print(status)

Output

Relaxing at the beach

• We can update variables as often as we want. Try it yourself: change the value of status to “New data required”.

Script.py

status = “Incomplete”

status = “Complete”

print(status)

status = “New data required”

print(status)

Output

Complete

New data required

• We can also give variables the values of other variables. Here, we can give the new_status variable the value of default_option.

Script.py

default_option = “upload”

new_status = “download”

new_status = default_option

print(new_status)

Output

Upload

• When we update a variable, it forgets its previous value. Here, we can display the status variable twice and see how its value updates.

Script.py

status = “Playing football”

print(status)

status = “Walking the dog”

print(status)

Output

Playing football

Walking the dog

• Which of these lines of code updates the status variable? Status = “Working out”
• What does this code display in the console? Watching Netflix.

Script.py

status = “Watching Netflix”

print(status)

Output

Watching Netflix

• What´s wrong with this code? Nothing is wrong with this code.

Script.py

name = “Lori”

name = “Joe”

• What does this code display in the console? Median

Script.py

analysis = “Mean”

analysis = “Median”

print(analysis)

Output

Median

• Change the value in the temperature variable to “100 degrees”.

Script.py

temperature = “0 degrees”

temperature = “100 degrees”

print(temperature)

Output

100 degrees

• Update the status variable to “Writing code”.

Script.py

status = “Completing spreadsheet”

status = “Writing code”

print(status)

Output

Writing code

• Update the currency variable to “Dollar”.

Script.py

currency = “Euro”

currency = “Dollar”

print(currency)

Output

Dollar

• Change the value of the status variable to “Done”.

Script.py

status = “Unfinished”

status = “Done”

print(status)

Output

Done

Apuntes:

ADN = (“Inserte la secuencia: ”)

Uso de repleace: print(ADN.repleace(“Cambio”, “”))

Número de Adeninas: Num_A = ADN.count(“A”) #Cuenta cuantas “A” Hay en algo.

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