사용자 정의 함수 만들기

직접 함수를 정의해야 하는 이유

함수 만들기

def function_name(parameters):
    # Code to execute
    print("Hello, Python!")

함수 호출하기

# Defines the greet function
def greet():
    print("Hello, Python!")  # Prints a greeting message

# Calls the greet function
greet()

함수 매개변수

# Defines a function with two parameters
def add(a, b):
    total = a + b  # Adds the two numbers
    print("Total:", total)  # Prints the sum

# Calls the function with arguments
add(5, 3)

기본 매개변수 사용하기

# Defines a function with a default parameter
def greet(name="Python Learner"):
    print("Hello, " + name + "!")  # Prints a personalized greeting

# Calls the function without an argument
greet()  # Output: Hello, Python Learner!

# Calls the function with an argument
greet("Alice")  # Output: Hello, Alice!

함수에서 값 반환하기

# Defines a function that returns the sum of two numbers
def add(a, b):
    total = a + b  # Adds the two numbers
    return total  # Returns the sum

# Calls the function and stores the returned value
result = add(10, 7)
print("Total:", result)  # Prints the sum

여러 값 반환하기

# Defines a function that returns multiple values
def get_user_info(name, age):
    return name, age  # Returns name and age

# Calls the function and unpacks the returned values
user_name, user_age = get_user_info("Bob", 25)
print("Name:", user_name)  # Output: Name: Bob
print("Age:", user_age)    # Output: Age: 25

# Function that checks if a number is even
def is_even(number):
    if number % 2 == 0:
        return True  # Returns True if number is even
    else:
        return False  # Returns False if number is odd

# Calls the function with number 7
result = is_even(7)
print(result)

잘하셨습니다!