Matrix

 Matrix in python:

1) take input matrix :

    m=[]

    r,c=map(int,input().split())

    for i in range(r):

        a=[]

        for j in range(c):

            a.append(int(input()))

        m.append(a)

    print(m)

    output:

            2 4

            1 

            2

            3

            4

            5

            6

            7

            8

            [[1, 2, 3, 4], [5, 6, 7, 8]]

                                    OR

           r,c=map(int,input().split())

        m=[[int(input()) for i in range(r)] for j in range(c)]

        print(m)

                                            OR

    R = int(input("Enter the number of rows:"))

    C = int(input("Enter the number of columns:"))

    matrix = []

    print("Enter the entries rowwise:")

    for i in range(R):  

a =[]

for j in range(C):  

a.append(int(input()))

matrix.append(a)

    for i in range(R):

for j in range(C):

print(matrix[i][j], end = " ")

print()

                                             OR

        

        import numpy as np

        r,c=map(int,input().split())

        l=list(map(int,input().split()))

        m=np.array(l).reshape(r,c)

        print(m)

Python modules

Python modules:

syntax:import module

math:

      import math

        print(math.sqrt(25))         #5.0

        print(math.factorial(5))    #120

    or

      from math import sqrt,factorial

        print(sqrt(25))                            #5.0

        print(factorial(5))                       #120

import all names from module use --> *

    

        from math import *

        print(sqrt(25))                #5

        print(factorial(5))            #120

Renaming the module:

        import math as m

        print(m.sqrt(36))            #6

        print(m.factorial(4))        #24

Random number:

        import random

        print(random.randint(4,55))

calendar:

        import calendar

        print (calendar.calendar(2022))

programming in python

 

Intro to Programming with Python

Software

Software is a set of instructions to the hardware.

Programming

Programming means writing the instructions to create a software.

Code

The instructions that we write to create software is called Code.

Syntax

Similar to Grammar rules in English, Hindi, each programming language has a unique set of rules. These rules are called the Syntax of a Programming Language.

Why Python

Python is an easy to learn, powerful programming language. With Python, it is possible to create programs with minimal amount of code. Look at the code in Java and Python used for printing the message "Hello World"

Java:

    class Main {

        public static void main(String[] args) {

           System.out.println("Hello World");

    }

}

Python:

        print("Hello World")

Applications of Python

Python is a versatile language which has applications in almost every field

• Artificial intelligence (AI)
• Machine Learning (ML)
• Big Data
• Smart Devices/Internet of Things (IoT)
• Cyber Security
• Game Development
• Backend Development, etc.

Career Opportunities

Python developers have plenty of opportunities across the world

• DevOps Engineer
• Software Developer
• Data Analyst
• Data Scientist
• Machine Learning (ML) Engineer
• AI Scientist, etc.

Hello World Program in Python

Here is a simple Python code that you can use to display the message "Hello World"

        print("Hello World!")        #Hello World!

Possible Mistakes

Possible mistakes you may make while writing Python code to display the message "Hello World"

• Spelling Mistake in print

1

prnt("Hello World!")

PYTHON

• Uppercase ‘P’ in Print

1

Print("Hello World!")

PYTHON

• Missing quotes

1

print(Hello World!)

PYTHON

• Missing parentheses
1
print("Hello World!"
PYTHON

Printing Without Quotes

If we want to print the numerical result of 2 + 5, we do not add quotes.

Code

1

print(2 + 5)

PYTHON

Output

7

If we want to print the exact message "2 + 5", then we add the quotes.

Code

1

print("2 + 5")

PYTHON

Output

2 + 5

Calculations with python

Addition

Addition is denoted by

+

sign. It gives the sum of two numbers.

Code

1

2

print(2 + 5)

print(1 + 1.5)

PYTHON

Output

7

2.5

Subtraction

Subtraction is denoted by

-

sign. It gives the difference between two numbers.

Code

1

print(5 - 2)

PYTHON

Output

3

Multiplication

Multiplication is denoted by

*

sign.

Code

1

2

print(2 * 5)

print(5 * 0.5)

PYTHON

Output

10

2.5

Division

Division is denoted by

/

sign.

Code

1

2

print(5 / 2)

print(4/2)

PYTHON

Output

2.5  2.0