Python- Day 27- FUNCTIONS-Storing Functions in Modules

This will be the last topic of Functions in Python

Function Separation:

Functions help organize code, improving readability.

Functions can be stored in separate files (modules) for better code management and reusability.

pizza.py (module file)

# pizza.py

def make_pizza(size, *toppings):
    
    print(f"\nMaking a {size}-inch pizza with the following toppings:")

    for topping in toppings:
        print(f"- {topping}")

making_pizzas.py (main program)

# making_pizzas.py

import pizza

pizza.make_pizza(16, 'pepperoni')
pizza.make_pizza(12, 'mushrooms', 'green peppers', 'extra cheese')

>>


Making a 16-inch pizza with the following toppings:
- pepperoni

Making a 12-inch pizza with the following toppings:
- mushrooms
- green peppers
- extra cheese

Importing Modules:

Use import module_name to access all functions in a module.

In this case, only the function make_pizza is imported instead of the whole module.

making_pizzas.py (main program)

# making_pizzas.py
from pizza import make_pizza

make_pizza(16, 'pepperoni')
make_pizza(12, 'mushrooms', 'green peppers', 'extra cheese')

Using ‘as’ to Give a Function an Alia

If the function name is long or conflicts with another function name, an alias can be used.

making_pizzas.py (main program)

# making_pizzas.py

from pizza import make_pizza as mp

mp(16, 'pepperoni')
mp(12, 'mushrooms', 'green peppers', 'extra cheese')

Using ‘as’ to Give a Module an Alias:

To make the module name shorter, use an alias for the module itself.

making_pizzas.py (main program)

# making_pizzas.py

import pizza as p

p.make_pizza(16, 'pepperoni')
p.make_pizza(12, 'mushrooms', 'green peppers', 'extra cheese')

Importing All Functions from a Module:

When using the asterisk (*), all functions in the module are available directly by their names.

making_pizzas.py (main program)

# making_pizzas.py
from pizza import *

make_pizza(16, 'pepperoni')
make_pizza(12, 'mushrooms', 'green peppers', 'extra cheese')

Styling Functions and Modules:

Here are styling examples following PEP 8 guidelines:

Module Naming and Function Definition with Docstring:

# pizza_maker.py

def make_pizza(size, *toppings):

#Prepare a pizza of given size with the specified toppings.
    print(f"\nMaking a {size}-inch pizza with the following toppings:")

    for topping in toppings:
        print(f"- {topping}")

PEP 8 Line Length, Indentation, and Import Placement:

# order_pizza.py

from pizza_maker import make_pizza

# Making pizzas with proper line length and indentation

make_pizza(16, 'pepperoni', 'green peppers', 'mushrooms')
make_pizza(
    12, 'extra cheese', 'sausage', 'pineapple',
    'olives', 'onions', 'bell peppers'
)

These examples show how to create, import, and use functions in modules, and follow best practices to keep code organized and readable.

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