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def add(x, y):

result = x + y

print(result)

add(2, 3) # 5

# -- If a function doesn't have parameter, you can't give it arguments --

def say_hello():

print("Hello!")

say_hello("Bob") # Error

# -- But if you add a parameter, then you must give it an argument --

def say_hello(name):

print(f"Hello, {name}!")

say_hello("Bob")

say_hello() # Error, needs an argument

# -- Keyword arguments --

# To make things clearer, in Python you can give keyword arguments.

def say_hello(name):

print(f"Hello, {name}!")

say_hello(name="Bob") # Obvious that this is someone's name

def divide(dividend, divisor):

if divisor != 0:

print(dividend / divisor)

else:

print("You fool!")

divide(dividend=15, divisor=3)

divide(15, 0)

divide(15, divisor=0) # That's OK

# divide(dividend=15, 0) # Not OK, named arguments must go after positional arguments

# I recommend you use keyword arguments whenever possible, just because it makes things much more readable and maintainable long-term.