Essential Python Programming Examples for Beginners

Posted on May 1, 2026 in Computers

Unit Conversions

print("Select Conversion:")
print("1. Rupees to Dollar")
print("2. Celsius to Fahrenheit")
print("3. Inches to Feet")
choice = int(input("Enter your choice: "))
if choice == 1:
    rupees = float(input("Enter amount in Rupees: "))
    dollars = rupees / 83 # approx rate
    print("Amount in Dollars =", dollars)
elif choice == 2:
    c = float(input("Enter temperature in Celsius: "))
    f = (c * 9/5) + 32
    print("Temperature in Fahrenheit =", f)
elif choice == 3:
    inches = float(input("Enter inches: "))
    feet = inches / 12
    print("Value in Feet =", feet)
else:
    print("Invalid Choice")

Student Record Management

students = {}
while True:
    print("\n--- Student Record Menu ---")
    print("1. Add Student")
    print("2. Update Student")
    print("3. Display Students")
    print("4. Delete Student")
    print("5. Exit")
    choice = int(input("Enter your choice: "))
    if choice == 1:
        name = input("Enter student name: ")
        marks = int(input("Enter marks: "))
        attendance = int(input("Enter attendance: "))
        students[name] = {"Marks": marks, "Attendance": attendance}
        print("Student added successfully!")
    elif choice == 2:
        name = input("Enter student name to update: ")
        if name in students:
            marks = int(input("Enter new marks: "))
            attendance = int(input("Enter new attendance: "))
            students[name]["Marks"] = marks
            students[name]["Attendance"] = attendance
            print("Record updated!")
        else:
            print("Student not found!")
    elif choice == 3:
        print("\nStudent Records:")
        for name, data in students.items():
            print(name, "-> Marks:", data["Marks"], ", Attendance:", data["Attendance"])
    elif choice == 4:
        name = input("Enter student name to delete: ")
        if name in students:
            del students[name]
            print("Student deleted!")
        else:
            print("Student not found!")
    elif choice == 5:
        print("Exiting program...")
        break
    else:
        print("Invalid choice!")

Loops and Character Analysis

rows = int(input("Enter number of rows: "))
for i in range(1, rows + 1):
    for j in range(i):
        print("*", end=" ")
    print()
ch = input("Enter a character: ")
if ch.islower():
    print("Lowercase Character")
elif ch.isupper():
    print("Uppercase Character")
elif ch.isdigit():
    print("Digit")
else:
    print("Special Character")
num = int(input("Enter a number: "))
for i in range(1, 11):
    print(num, "x", i, "=", num * i)

File Processing

file = open("sample.txt", "r")
data = file.read()
file.close()
words = data.split()
length = int(input("Enter word length to find: "))
print("Words with length", length, ":")
for word in words:
    word = word.strip(",.!?;:")
    if len(word) == length:
        print(word)

Error Handling

try:
    a = int(input("Enter first number: "))
    b = int(input("Enter second number: "))
    result = a / b
    print("Result =", result)
except ZeroDivisionError:
    print("Error: Division by zero is not allowed!")
except ValueError:
    print("Error: Please enter valid numbers!")
finally:
    print("Program executed successfully.")

Object-Oriented Programming

class Student:
    def __init__(self, name, marks):
        self.name = name
        self.marks = marks
    def display(self):
        print("Name:", self.name)
        print("Marks:", self.marks)
# Creating object
s1 = Student("Rahul", 85)
s2 = Student("Priya", 92)
# Calling method
s1.display()
print()
s2.display()

Regex Validation

import re
phone = input("Enter phone number: ")
email = input("Enter email: ")
phone_pattern = "^[6-9][0-9]{9}$"
email_pattern = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"
if re.match(phone_pattern, phone):
    print("Valid phone number")
else:
    print("Invalid phone number")
if re.match(email_pattern, email):
    print("Valid email")
else:
    print("Invalid email")
password = input("Enter password: ")
if (len(password) >= 8 and
    re.search("[A-Z]", password) and
    re.search("[a-z]", password) and
    re.search("[0-9]", password) and
    re.search("[@#$%^&*]", password)):
    print("Strong password")
else:
    print("Weak password")

Data Analysis with NumPy

import numpy as np
data = np.array(list(map(float, input("Enter numbers: ").split())))
print("Mean:", np.mean(data))
print("Median:", np.median(data))
print("Standard Deviation:", np.std(data))
print("Variance:", np.var(data))
data2 = np.array(list(map(float, input("Enter second array: ").split())))
print("Correlation Coefficient:", np.corrcoef(data, data2)[0][1])

Geometry Calculations

import math
print("Select Shape:")
print("1. Circle")
print("2. Rectangle")
print("3. Triangle")
choice = int(input("Enter your choice: "))
if choice == 1:
    r = float(input("Enter radius: "))
    area = math.pi * r * r
    print("Area of Circle =", area)
elif choice == 2:
    l = float(input("Enter length: "))
    b = float(input("Enter breadth: "))
    area = l * b
    print("Area of Rectangle =", area)
elif choice == 3:
    b = float(input("Enter base: "))
    h = float(input("Enter height: "))
    area = 0.5 * b * h
    print("Area of Triangle =", area)
else:
    print("Invalid Choice")