Lecture notes

Complete Python Programming from Basics to Advanced Concepts

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Module
Computer Science

Institution
University Of Westminster (UOW)

All the notes gives a very good understanding of the basic and the advanced concepts in python programming, this also covers the area of OOP.

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Uploaded on June 11, 2023
Number of pages 7
Written in 2022/2023
Type Lecture notes
Professor(s) Mr.saman
Contains All classes

python
pp1
programming principles 1
object oriented programming with python

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6/10/23, 2:07 PM Variables and Data Types.ipynb - Colaboratory

Variables and Data Types 🔥

Variables 🚀

Variable are containers for storing data values.

Creating a Variable
A variable is created the moment you first assign a value to it.

x = 5
print(x)

5

y = "Nazhim"
print(y)

Nazhim

z = 2.56
print(z)

2.56

a = True
b = False

print(a)
print(b)

True
False

Variables do not need to be declared with any particular type, and can even change type after they have been set.

# Firstly the variable 'number' is stores 5
number = 5
print(number)

# Now, we update the content of the variable 'number'
number = "Kevin"
print(number)

5
Kevin

What are comments ?
Comments can be used to explain Python code.

Comments can be used to make the code more readable.

Comments can be used to prevent execution when testing code.

Comments starts with a #

Comments have no affect with the program code, its only used to give the user some meaning of the code

Single Line Comment

# This is a single line comment
https://colab.research.google.com/drive/1TYB6-QkORCNTdH4X2b8C8z0eJDP6xxRF 1/7

, 6/10/23, 2:07 PM Variables and Data Types.ipynb - Colaboratory
g

Multi Line Comment

# This
# is
# a
# multi
# line
# comment

Casting
If you want to specify the data type of a variable, this can be done with casting.

You can get the data type of a variable with the type() function.

x = str(3) # x will be '3'
y = int(3) # y will be 3
z = float(3) # z will be 3.0

print(x, y, z)
print(type(x), type(y), type(z))

3 3 3.0
<class 'str'> <class 'int'> <class 'float'>

Single or Double Quotes in Strings

x = "Nazhim"
y = 'Nazhim'

print(x)
print(y)

Nazhim
Nazhim

Case Sensitive
Variable names are case-sensitive

a = 4
A = "Sally"

# A will not overwrite a

print(a, A)

4 Sally

Quick Code Summary Example of what Variables and Comments

name = "Nazhim" # variable 'name' stores the String 'Nazhim'
age = 25 # variable 'age' stores the integer number 25
height = 6.1 # variable 'height' stores the decimal value 6.1

# Now let's print out the results of the variables
print("My name is " + name) # we don't cast the name variable because its already in the same type which is String
print("I am " + str(age) + " years old")
print("I am " + str(height) + " feet tall")

My name is Nazhim
I am 25 years old
I am 6.1 feet tall
https://colab.research.google.com/drive/1TYB6-QkORCNTdH4X2b8C8z0eJDP6xxRF 2/7

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