Sample codes in Python

a=int(input("Enter first Number"))
b=int(input("Enter second Number"))
c=int(input("Enter third Number"))
sum=a+b+c
print(sum)

 m=int(input("Enter your marks"))
if(m>=90):
    print("You have Passed with First Distinction")

else:
    if(m>=60):
        print("You have passed with Second Distinction")
    else:
        if(m>=35):
            print("You have just passed work hard next time")
        else:
            print("Failed")

def my_binary(n):
    i=''
    while n>1:
        a = n%2
        n = n//2
        i=str(a)+i
    i=  str(n%2) +i   
    print (i)
    
a=my_binary(156) 

x=float(input("input number "))
y=int(x+0.5)
print(y)

1. Positive, Negative, or Zero Check

Demonstrates multi-way decision logic using an if-elif-else ladder to evaluate numerical state.

# Program to check if a number is positive, negative, or zero
num = float(input("Enter a number: "))

if num > 0:
    print("The number is Positive.")
elif num < 0:
    print("The number is Negative.")
else:
    print("The number is Zero.")

2. Print Even Numbers (1 to 20)

Combines a for loop with a modulo (%) conditional check to filter even numbers.

# Program to print all even numbers from 1 to 20
print("Even numbers between 1 and 20:")

for i in range(1, 21):
    if i % 2 == 0:
        print(i, end=" ")

3. Vowel or Consonant Checker

Uses membership evaluation (in) and string validation methods to route inputs safely.

# Program to check whether a letter is a vowel or consonant
char = input("Enter a single letter: ").lower()

if len(char) == 1 and char.isalpha():
    if char in 'aeiou':
        print(f"'{char}' is a Vowel.")
    else:
        print(f"'{char}' is a Consonant.")
else:
    print("Invalid input! Please enter a single alphabetic character.")

4. Find the Largest of Three Numbers

Demonstrates compound logical statements using the and operator to validate conditions.

# Program to find the largest among three numbers
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
num3 = float(input("Enter third number: "))

if num1 >= num2 and num1 >= num3:
    largest = num1
elif num2 >= num1 and num2 >= num3:
    largest = num2
else:
    largest = num3

print(f"The largest number is: {largest}")

5. Multiplication Table Generator

Uses a standard for loop with formatted strings to generate structured outputs.

# Program to generate multiplication table for a given number
num = int(input("Enter a number for the multiplication table: "))

print(f"\nMultiplication Table for {num}:")
for i in range(1, 11):
    print(f"{num} x {i} = {num * i}")

6. Count Vowels in a Sentence

Iterates through string characters and increments a counter variable when conditions match.

# Program to count total vowels in a sentence
text = input("Enter a sentence: ")
vowel_count = 0

for char in text.lower():
    if char in 'aeiou':
        vowel_count += 1

print(f"Total number of vowels: {vowel_count}")

7. Leap Year Checker

Illustrates complex boundary evaluation using precedence with and & or operators.

# Program to check if a year is a leap year
year = int(input("Enter a year: "))

if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
    print(f"{year} is a Leap Year.")
else:
    print(f"{year} is NOT a Leap Year.")

8. Sum of N Natural Numbers

Demonstrates accumulation logic inside a loop construct over a designated range.

# Program to calculate sum of numbers from 1 to N
n = int(input("Enter a positive integer N: "))
total = 0

for i in range(1, n + 1):
    total += i

print(f"The sum of numbers from 1 to {n} is: {total}")

PageSpeed Insights (PSI)

import urllib.request, json
key='YOUR_API_KEY' # Use your API key here 

x = "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url="
x= x + 'https://www.plus2net.com/python/pdf-grid.php'
x= x + '&strategy=desktop' # other value is mobile 
x= x + '&locale=en'
x= x + '&key='+key

response = urllib.request.urlopen(x)
data = json.loads(response.read()) # get the return Json data 
score = data["lighthouseResult"]["categories"]["performance"]["score"]
print(score) 

• FCP (First Contentful Paint): The time it takes for the first piece of content to appear on the screen.
• LCP (Largest Contentful Paint): Measures the loading performance of the largest content element visible in the viewport.
• CLS (Cumulative Layout Shift): Evaluates the visual stability by measuring unexpected layout shifts during the page load.
• INP (Interaction to Next Paint): Measures the responsiveness by evaluating the time from user interaction to the next frame painted.

fcp = data["loadingExperience"]["metrics"]["FIRST_CONTENTFUL_PAINT_MS"]["percentile"] 
fid = data["loadingExperience"]["metrics"]["FIRST_INPUT_DELAY_MS"]["percentile"]
lcp = data["loadingExperience"]["metrics"]["LARGEST_CONTENTFUL_PAINT_MS"]["percentile"]
cls = data["loadingExperience"]["metrics"]["CUMULATIVE_LAYOUT_SHIFT_SCORE"]["percentile"]/100

print('fcp:',fcp,'fid: ',fid,'lcp:',lcp,'cls:',cls) 

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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