This document provides an overview of core concepts in Python including variables, keywords, data types, comments, and basic programs. It discusses how variables are used to store data values without needing declaration. The different data types in Python like integers, floats, strings, lists, tuples, and dictionaries are explained along with examples. It also demonstrates how to write single line and multiline comments and includes examples of basic Python programs to perform mathematical operations like addition, subtraction, multiplication and division of numbers.

1. Marathwada Mitramandal’s
COLLEGE OF ENGINEERING
Karvenagar, Pune
Accredited with ‘A++’ Grade by NAAC
Presentation
On
Core Concepts In Python
By
Mrs. Ashwini Raut
Department of Computer Engineering

2. Agenda
VARIABLES KEYWORDS DATA TYPES COMMENT BASIC
PROGRAMS

3. Variables in Python
Variables are containers for storing data values.
Python has no command for declaring a variable.
A variable is created the moment you first assign a value to it.
E.g
• x = 5
• y = "John“
• z= 5.5
print(x)
print(y)
• print(z)

4. Get The Type of variables
• You can get the data type of a variable with the type() function.
• E.g:
x = 5
y = "John”
z= 5.5
print(type(x))
print(type(y))
print(type(z))
Output: <class 'int’>
<class 'str’>
<class ‘float'>
<class 'str'>

5. Keywords
• Python has a set of keywords that are reserved words that cannot be used as
variable names, function names, or any other identifiers:
• There are 35 keywords in python 3.13 version
import keyword
print("Python keywords are...")
print(keyword.kwlist)

6. Data Types in Python
• It’s the type of data particular variable is holding.
• E.g: int,float.

7. Data types in
python

9. Example of Numeric Data Type
a =20
b=20.5
c=3+4j
print(type(a))
print(type(b))
print(type(c))
Output :
<class 'int’>
<class 'float’>
<class 'complex'>

11. String
• Strings in python are surrounded by either single quotation
marks, or double quotation marks.
'hello' is the same as "hello“
E.g:
print("Hello")
print('Hello’)
Output:
Hello
Hello

12. Accessing
Characters String
We will define a string in Python and access its characters using positive and
negative indexing. The 0th element will be the first character of the string
whereas the -1th element is the last character of the string.

13. Example
String1 = "Hello"
print("Initial String: ")
print(String1)
print("nFirst character of String is: ")
print(String1[0])
print("nLast character of String is: ")
print(String1[-1])
Output:
Initial String:
Hello
First character of String is:
H
Last character of String is:
O

14. List
• Lists are used to store multiple items in a single variable.
• Lists are created using square brackets:
E.g:
thislist = ["apple", "banana", "cherry"]
print(thislist)
Output: [‘apple’, ’banana’, ’cherry’] ', 'cherry']

15. Tuple
• Tuples are used to store multiple items in a single variable.
• A tuple is a collection which is ordered and unchangeable.
• Tuples are written with round brackets.
E.g:
thistup = ("apple", "banana", "cherry“)
print(thistup)
Output: (‘apple’, ’banana’, ’cherry’), 'banana', 'cherry']

16. Dictionary
• Dictionaries are used to store data values in key:value pairs. ‘
thisdict = {
"brand": "Ford",
"model": "Mustang",
"year": 1964
}
print(thisdict)
Output: ‘
{"brand": "Ford","model": "Mustang", "year": 1964}
{'brand': 'Ford', 'model': 'Mustang', 'year': 1964} c
{'brand': 'Ford', 'model': 'Mustang', 'year': 1964}herry']

17. Comments in Python
• 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

18. Single Line Comment
• Single line comment is starts with #
• E.g:
#Program to print hello world
print(“Hello World!!”)
Output:
Hello World!!

19. Multiline Comment
• Multiline comments are enclosed with triple quotes(“””)
as multiline comments.
E.g:
“””Python Program to demonstrate multiline
comment”””
print(“Hello World”)
Output:
Hello World

20. Basic Python program
1.Write a program in python to perform addition of two
numbers.
num1 = 10
num2 =20
sum= num1+num2
print(“Addition of two numbers are ”,sum)
Output:
Addition of two numbers are  30

21. Basic Python program
2.Write a program in python to perform subtraction of two
numbers.
num1 = 30
num2 =20
sub= num1-num2
print(“Subtraction of two numbers are ”,sub)
Output:
Subtraction of two numbers are  10

22. Basic Python program
3.Write a program in python to perform multiplication of two
numbers.
num1 = 10
num2 =20
mult= num1*num2
print(“Multiplication of two numbers are ”,mult)
Output:
Multiplication of two numbers are  200

23. Basic Python program
4.Write a program in python to perform division of two
numbers.
num1 = 20
num2 =10
div= num1/num2
print(“Division of two numbers are ”,div)
Output:
Division of two numbers are  2

24. Basic Python program
• Write a program to perform addition of two numbers (take numbers
from users)
num1 = int(input(“Please enter value for num1”))
num2 = int(input(“Please enter value for num2”))
sum = num1 + num2
print(“The sum of two numbers”, sum)
Output :
Please enter value for num110
Please enter value for num290
The sum of two numbers100