Data types

Write the formula in Python

Write programs that calculates and displays the answers to the following formulas. Remember that when you see something like P = IV, this is the same as P = I × V. Create your own values to test each of them (e.g a = 10, b = 20):

x = a + b
P = IV
F = ma
E = mc²

Write the formula in Python

Write programs that calculates and displays the answers to the following formulas. Remember that when you see something like P = IV, this is the same as P = I × V. Create your own values to test each of them (e.g a = 10, b = 20):

x = a + b
P = IV
F = ma
E = mc²

a = 10
b = 20
c = 15
I = 1
V = 2
m = 20

x = a + b
P = I * V
F = ma
E = m * c * c

print(x)
print(P)
print(F)
print(E)

Learning Intentions

Develop our understanding of variables
Understand how to use comments within our programs
Know the different data types

Success Criteria

I can develop my own program using variables
I can develop a program that performs checking the data types of variables

Variables in Python

print("Please insert a number")
y = int(input())
z = 2

x = y * z

print(x)

Write a very short three-line program that will ask the user "Please insert your name" then take in a user’s name and stores it in a variable and then display "Hello " and the user’s name.

Step 1: Print to the screen "Please insert your name"
Step 2: Get the user’s input
Step 3: Display the "Hello " and the user’s input

Task

Comments

One of the most important things in programming, especially if you choose to do Computing Science in National 4/5, is internal comments.
A comment is a piece of text within the program that describes what your code does. Python ignores comments when it is run.
In Python, a comment line starts with a hashtag sign #
It is important to note that comments only go across one line, so each line after that will need a # at the start too

Using comments

We should get used to using comments so that when we look back at our programs, we can understand what each piece of code does without needing to look it up.

#Display to the user Please insert a number
print("Please insert a number")
#Get the number from the user and put it in y
y = int(input())
z = 2

#Do the calculation
x = y * z
#Print the result
print(x)

Data types

A data type is the type of the data you are storing in a variable.
For instance, when we are storing a number using the int(input()) function we are getting an integer.
Python has 5 data types we need to know about.

Why do we need to know about data types?

Understanding how a computer stores data is important for us because we sometimes need to convert the data to another type. For example, if we use the input() function we have been using in the past examples the computer expects text even if we want a number.
To convert the text into a number so that we can use it in calculations we use the int() function. This tells the computer that it should now consider that string as an integer.

Data type conversion

We have multiple ways of converting data that we are going to use for the next part of this lesson:

Data type conversion

Converting the data is possible using the functions str, int and float.

x = "10"
print(x)

y = int(10)
print(y)

Data types

For each of the following pieces of data, write down the data type you would expect the value variable to be:

String

value = "Hello world"

Character

value = "0"

Boolean

value = True

Float

value = 0.5

String

value = "101Paris"

Character

value = "c"

Why do we need to know about data types?

Understanding how a computer stores data is important for us because we sometimes need to convert the data to another type. For example, if we use the input() function we have been using in the past examples the computer expects text even if we want a number.
To convert the text into a number so that we can use it in calculations we use the int() function. This tells the computer that it should now consider that string as an integer.
Computers store data in the memory, but without the program knowing what data type is being used it's just a bunch of 1s and 0s.

10101100 10111100 01110111

Checking the type

Python has a very useful way of checking the data type of a variable using the type() function.
For example:

name = "Jack"
print(type(name))
age = 12
print(type(age))

Your task is to create a program that displays the type of three different variables.

To do this, you will need to create three variables and use three type functions to get their types. What do you notice about their types when they are displayed?

tESTING THE TYPE FUNCTION

var1 = 11.3
print(type(var1))

Your task is to complete the written task on page 7 of the Python booklet.

Once you have done that you can go back to your computer and create a program to test these types using the type() function.

You can continue with the tasks up to page 16 in the Python booklet.

Task

Presentation Overview

Data types

17:09 | 29-04-2024

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