Lecture: Hello World

Printing "Hello World" on the output console:

print('Hello world')

Lecture: Mathematical operators in Python

Addition:

100+20

Subtraction:

200-40

Multiplication:

45*67

Complex mathematical operations:

4*6*(28+5)

Division:

200/2

Floor division:

If we do not want to get a decimal value we could use // instead of /.

200//2

Divide by zero:

345/0

This will give a divide by zero error.

Mathematical operations with float:

12.0 * 4

Lecture: Complex mathematical operations

Modulus:

21%4

Modulus with float:

456.34%2

Clearing Python Shell:

On Windows:

import os
os.system('cls')

On Mac/Linux:

import os
os.system('clear')

Lecture: Strings in Python

Escaping a single quote: i.e a " ' ":

'He\\'s a good guy'

Output:

" He's a good guy "

Using single quotes to escape double quotes:

'This is the "only" way to go'

Escaping multiple double quotes:

"This is the \"only\" way to go"

Lecture: Accepting user input

input('Enter your name')

Lecture: String operations

To check the data type:

type(8)
type('8')

String operations

Concat:

"Hello" + " world"

Including space between two strings:

"Hello " +  "World"

Concatenating two numbers as a string:

"10" + "10"

Concatenating string & number as a string.

"Hello " + "5"

Concatenating string with a number

"Hello" + 5

Multiplying a string with a number

"Hello " * 4

Multiplying a string with another string

"Hello" * "Hi"

Lecture: Data types in Python

Integer:

print(10)
type(10)

Float or floating point numbers:

type(6.2)

A boolean type :

>>> True
True
>>> False
False
>>> type(True)
<class 'bool'>
>>> type(False)
<class 'bool'>

Complex numbers:

5+9j

Lecture: Variables in Python

Declaring a variable:

a = 200

Declaring another variable b:

b=20

Value of a variable can be changed at any instance:

a= 100
print(a)
a=200
print(a)

String variables:

name = "John"
type(name)

Float Variable:

a= 3.2
type(a)

Boolean Variable:

b= True
type(b)

Lecture: Accepting Input & Adding Numbers

a = int(input("Enter First Number"))
b = int(input("Enter second Number"))
print(a+b)

Lecture: Generating Username & Password Using Concatenation

firstname = input("Enter firstname: ")
lastname = input("Enter lastname: ")
username = firstname+lastname

email = firstname+lastname+"@gmail.com"
print("Username is: "+username)
print("Email is: "+email)

Lecture: Comparing User Strings

saved_password = "123admin123"
user_password = input("Enter password")
print(saved_password==user_password)

Lecture: Creating A Simple Interest Calculator

principal = int(input("Enter amount lent"))
years = float(input("Enter lending period in years"))
rate = float(input("Enter rate of interest"))

interest = principal * years * rate / 100
print("Simple interest calculated is"+ str(interest))

Lecture: F Strings In Python

principal = int(input("Enter amount lent"))
years = float(input("Enter lending period in years"))
rate = float(input("Enter rate of interest"))

interest = principal * years * rate / 100
print(f"Simple interest on the principal amount $ {principal} for a period of {years} years at the rate of {rate} is $ {interest}")

Lecture: Creating BMI Calculator

weight = float(input('Enter weight in kgs'))
height = float(input('Enter height in meters'))

bmi = weight/(height*height)
print('BMI is: '+str(bmi))