Python Functions Complete Notes

def namste():
    print("Hello Gagan")

namste()

def greet(name):
    print(f"Hello {name}")

greet("Gagan")
greet("Rajat")

def calculator(a, b):
    print(f"Addition = {a + b}")
    print(f"Subtraction = {a - b}")
    print(f"Multiplication = {a * b}")
    print(f"Division = {a / b}")
    print(f"Floor Division = {a // b}")
    print(f"Modulus = {a % b}")

calculator(17, 4)

def add(a, b):
    return a + b

result = add(10, 20)
print(result * 2)

def calculate(a, b):
    addition = a + b
    subtraction = a - b
    multiplication = a * b
    return addition, subtraction, multiplication

res = calculate(20, 5)
print(res)

def greet(name="Gagan"):
    print(f"Hello {name}")

greet("Aman")
greet()

def student(name, age):
    print(f"Name = {name}, Age = {age}")

student(age=22, name="Gagan")

def add_numbers(*numbers):
    total = 0
    for number in numbers:
        total = total + number
    return total

print(add_numbers(10, 20, 30))

def student_info(**details):
    print(details)

student_info(name="Gagan", age=22, city="Chandigarh")

def print_names(names):
    for name in names:
        print(name)

students = ["Gagan", "Rajat", "Lokesh"]
print_names(students)

def show_student(student):
    print(f"Name = {student['name']}")
    print(f"Age = {student['age']}")

st_dict = {"name": "Gagan", "age": 22}
show_student(st_dict)

def check_even_odd(number):
    if number % 2 == 0:
        return "Even"
    else:
        return "Odd"

def largest(a, b, c):
    if a >= b and a >= c:
        return a
    elif b >= a and b >= c:
        return b
    else:
        return c

def circle_area(radius):
    return 3.14 * radius * radius

print(check_even_odd(10))
print(largest(10, 50, 15))
print(circle_area(5))

square = lambda x: x * x
print(square(5))

numbers = [1, 2, 3, 4, 5]
doubled = list(map(lambda x: x * 2, numbers))
print(doubled)

evens = list(filter(lambda x: x % 2 == 0, numbers))
print(evens)

count = 0

def increase():
    global count
    count = count + 1

increase()
increase()
print(count)

def q1():
    print("Hello World")

def q2(name):
    print(f"Hello {name}")

def q3(a, b):
    return a + b

def q4(a, b):
    return a - b

def q5(a, b):
    return a * b

def q6(a, b):
    return a / b if b != 0 else "Error"

def q7(n):
    return "Even" if n % 2 == 0 else "Odd"

def q8(n):
    if n > 0: return "Positive"
    elif n < 0: return "Negative"
    else: return "Zero"

def q9(a, b, c):
    return max(a, b, c)

def q10(l, w):
    return l * w

def q11(r):
    return 3.14 * r * r

def q12(b, h):
    return 0.5 * b * h

def q13(a, b):
    return (a + b) / 2

def q14(numbers):
    total = 0
    for num in numbers:
        total += num
    return total

def q15(numbers):
    return sum(1 for x in numbers if x % 2 == 0)

def q16(text):
    return text[::-1]

def q17(text):
    return text == text[::-1]

import re
def q18(email):
    pattern = r"^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}"
    return "Valid Email" if re.fullmatch(pattern, email) else "Invalid Email"

def q19(phone):
    return "Valid Phone" if re.fullmatch(r"^\d{10}$", phone) else "Invalid Phone"

def q20(marks):
    if marks >= 90: return "A+"
    elif marks >= 80: return "A"
    elif marks >= 70: return "B"
    elif marks >= 60: return "C"
    elif marks >= 40: return "D"
    else: return "Fail"

def q21(age):
    return "Eligible" if age >= 18 else "Not Eligible"

def q22(price, discount):
    return price - (price * discount / 100)

def q23(p, r, t):
    return (p * r * t) / 100

def q24(*args):
    return sum(args)

def q25(**kwargs):
    for key, val in kwargs.items():
        print(f"{key}: {val}")

def add(a, b): return a + b
def subtract(a, b): return a - b
def multiply(a, b): return a * b
def divide(a, b): return a / b if b != 0 else "Cannot divide by zero"

num1 = 20.0
num2 = 5.0

print(f"Addition = {add(num1, num2)}")
print(f"Subtraction = {subtract(num1, num2)}")
print(f"Multiplication = {multiply(num1, num2)}")
print(f"Division = {divide(num1, num2)}")

def calculate_total(price, quantity):
    return price * quantity

def calculate_discount(total, discount_percent):
    return total - (total * discount_percent / 100)

price = 500.0
quantity = 3
discount = 10.0

total = calculate_total(price, quantity)
final_amount = calculate_discount(total, discount)

print(f"Total Bill = {total}")
print(f"Final Amount after Discount = {final_amount}")