Python

Python Reference

if-else

Given an integer,n, perform the following conditional actions: If is odd, print Weird If is even and in the inclusive range of to , print Not Weird If is even and in the inclusive range of to , print Weird If is even and greater than, print Not Weird

Constraints 1<=n<=100

n = int(input().strip())
check = {True: "Not Weird", False: "Weird"}

print(check[
        n%2==0 and (
            n in range(2,6) or 
            n > 20)
    ])

Arithmetic_Operation

Task: Read two integers from STDIN and print three lines where: The first line contains the sum of the two numbers. The second line contains the difference of the two numbers (first - second). The third line contains the product of the two numbers.

Input Format: The first line contains the first integer,a . The second line contains the second integer,b.

Constraints: 1<=a<=10power(10) 1<=b<=10power(10)

a = int(input())
b = int(input())
print(a+b)
print(a-b)
print(a*b)

Loops

Read an integer,N. For all non-negative integers i<N, print i square

Constraints:

1<=N<=20

n = int(input())
for x in range(n):
    print(x**2)
    if x==n:
        break

Function

You are given the year, and you have to write a function to check if the year is leap or not.

1900<=year<=10power(5)

def is_leap(year):
    return year % 4 == 0 and (year % 400 == 0 or year % 100 != 0)
    leap = True
year = int(input())
print(is_leap(year))

Valid Phone number using regular expressions

You are given some input n, and you are required to check whether they are valid mobile numbers. A valid mobile number is a ten digit number starting with a 7,8 or 9.

Constraints 1<=n<=10 2<=len(number)<=15 For every string listed, print "YES" if it is a valid mobile number and "NO" if it is not on separate lines. Do not print the quotes.

import re 
for i in range(int(input())) : 
    if re.match(r'[789]\d{9}$',input()): 
        print('YES') 
    else: 
        print('NO')

here import re is importing regular expressions

Validating and parsing Email Addresses

A valid email address meets the following criteria: It's composed of a username, domain name, and extension assembled in this format: username@domain.extension The username starts with an English alphabetical character, and any subsequent characters consist of one or more of the following: alphanumeric characters, -,., and _. The domain and extension contain only English alphabetical characters. The extension is , , or characters in length.

Input Format: The first line contains a single integer,n, denoting the number of email address. Each line i of the n subsequent lines contains a name and an email address as two space-separated values following this format: name user@email.com

Constraints 1<n<100

import re //Importing regular expression
n = int(input())
pattern = r"^<[A-Za-z](\w|-|\.|_)+@[A-Za-z]+\.[A-Za-z]{1,3}>$"
for i in range(n):
    x,y = input().split(" ")
    if re.match(pattern,y):
        print(x,y)