PYTHON BASICS:

---

range function in python:

# Learn Python

Questions on loops in python:

• counting Number of Digits in a given number

• Sum of First n even numbers

• Algorithm for checking whether a given is a prime or not:

Questions on loops in python:

• Find Sum of first n natural numbers in python
• Optimized Approach
• Better Alogorithms could solve problems in a optimized approach

Functions in python:

Function should be defined so that:

• it accepts input
• it gives some ouput
• The input have some specific data type
• The produced will also have some specific data type ![Uploading Screenshot from 2023-07-13 14-18-38.png
• Similiarly we have input data type and out put data type for a function in python
• The output data type is called return type

Examples:

• What is the return type for input()?
  • String is the return type of input() function
  • 
  • 
• Write a function in python that tells whether a given numbers is an even number:
• 
• 

Exercise on Functions:

• Write a fucntion to check , whether a given number is prime.
  • Use both Brute Force Approach, and Optimized Approach

## Python Program to check whether a given number is prime using Brute Force Approach
n = int(input()) # taking input from user
flag = 0
for i in range(2,n):
  if n % i == 0:
    flag = 1
    break
if flag == 1:
  print("The given number is not prime")
else:
  print("The gven number is prime")

## Python Program to check whether a given number is prime using Optimized Approach
import math
n = int(input()) # taking input from user
flag = 0
for i in range(2,int(math.sqrt(n))+1):
  if n % i == 0:
    flag = 1
    break
if flag == 1:
  print("The given number is not prime")
else:
  print("The gven number is prime")

• Write a function that takes two integers as parameters and returns their sum.

## Python Program to design a function that returns sum
def SUM(a,b):
  return a+b
a = int(input("Enter a: "))
b = int(input("Enter b: "))
c = SUM(a,b)
print(c)

• Write a function that takes a list of numbers as input and returns the largest number in the list.

## Python Program to design a function that finds maximum in a list
def FindMax(li):
  Max = li[0]
  for i in range(len(li)):
    if li[i] > Max:
      Max = li[i]
  return Max
li = list(map(int,input().split()))
c = FindMax(li)
print(c)

• ONE LINE CODE

li = list(map(int,input().split()))
c = max(li)
print(c)

• Implement a function that reverses a given string.

def rev(a):
  b = ""
  for i in range(len(a)-1,-1,-1):
    b += a[i]
  return b # b will have reversed string
a = "chanakya"
print(rev(a))

a = "kushik"
b = a[::-1]
print(b)

• Implement a function that takes a list of words and returns a new list with the words sorted in alphabetical order.

def SortedList(li):
  li.sort()
  return li
li = input().split()
Li = SortedList(li)
print(Li)

split Function in python
li = list(map(int,input().split())) How does this work?

• Some Examples on split() function in python
• input() returns a string by default
• split() returns a list, it's argumnent is the seperator , default seperator is space
• input().split() returns a list of string seperated at space
• map type casts a list with given data type. and returns a map object.
• map object could be converted into list by list(map(....
• list(map(int,input().split())) returns a list of integers by mapping strings to their corresponding integer values.

li = list(map(int,['2','3','4']))
print(li)

• Write a function that removes duplicates from a list

• How Does jupyter notebook Work, How does it stores local variables data, how data is overriden?