AI6-Functions-2.py

def decorate_text(text):
    decoration = "\n\n**********{}**********\n\n"
    decorated_text = decoration.format(text)
    return decorated_text
 
# Unpacking of values

def generate_multiplications_1(multiplicand, start, stop):
    multiplications = []
    for multiplier in range(start, stop + 1):
        answer = multiplicand * multiplier
        multiplications.append(answer)
    return multiplications

values = [2, 1, 10]
print(generate_multiplications_1(*values))
kw_values = {"multiplicand": 8, "start": 1, "stop": 10}
print(generate_multiplications_1(**kw_values))

print(decorate_text('The generate_multiplications_1 function'))


# Packing of values into args

def generate_multiplications_2(*values):
    multiplicand = values[0]
    start = values[1]
    stop = values[2]
    multiplications = []
    for multiplier in range(start, stop + 1):
        answer = multiplicand * multiplier
        multiplications.append(answer)
    return multiplications

print(generate_multiplications_2(3, 1, 12))
print(generate_multiplications_2(5, 5, 20))

print(decorate_text('The generate_multiplications_2 function'))


# Packing of values into kwargs

def generate_multiplications_3(**kwargs):
    print("It packs it into a dictionary: ", kwargs, end='\n\n')
    multiplicand = kwargs["multiplicand"]
    start = kwargs["start"]
    stop = kwargs["stop"]
    multiplications = []
    for multiplier in range(start, stop + 1):
        answer = multiplicand * multiplier
        multiplications.append(answer)
    return multiplications

print(generate_multiplications_3(multiplicand=8, start=1, stop=10))
print(generate_multiplications_3(multiplicand=2, start=1, stop=10))

print(decorate_text('The generate_multiplications_3 function'))


# Creating Decorators
# Applying a decorator to an existing function

def show_even_numbers_only(func):
    def wrapper(*args, **kwargs):
        numbers = func(*args, **kwargs)
        even_numbers = []
        for number in numbers:
            if number % 2 == 0:
                even_numbers.append(number)
        return even_numbers
    return wrapper

# Using decorators
wrapper = show_even_numbers_only(generate_multiplications_1)
print(wrapper.__name__)

print(wrapper(3, start=1, stop=30))
print(wrapper(7, start=1, stop=30))

print(decorate_text('The show_even_numbers_only decorator function'))


# Decorating using an existing decorator function

@show_even_numbers_only
def generate_multiplications_4(multiplicand, start, stop):
    multiplications = []
    for multiplier in range(start, stop + 1):
        answer = multiplicand * multiplier
        multiplications.append(answer)
    return multiplications

print(generate_multiplications_4(10, start=1, stop=10))
print(generate_multiplications_4(6, start=10, stop=20))

print(decorate_text(
    'The generate_multiplications_4 function with the show_even_numbers_only decorator'
    ))



lyrics = [
    "Una mattina mi son alzato","O bella ciao, bella ciao, bella ciao, ciao, ciao", 
    "Una mattina mi son alzato","E ho trovato l'invasor",
    "O partigiano, portami via","O bella ciao, bella ciao, bella ciao, ciao, ciao",
    "O partigiano, portami via","Ché mi sento di morir",
    "E se io muoio da partigiano","O bella ciao, bella ciao, bella ciao, ciao, ciao",
    "E se io muoio da partigiano","Tu mi devi seppellir", "E seppellire lassù in montagna", 
    "O bella ciao, bella ciao, bella ciao, ciao, ciao","E seppellire lassù in montagna", 
    "Sotto l'ombra di un bel fior", "E le genti che passeranno",
    "O bella ciao, bella ciao, bella ciao ciao ciao","E le genti che passeranno", 
    "Mi diranno «che bel fior.", "Questo è il fiore del partigiano", 
    "O bella ciao, bella ciao, bella ciao ciao ciao","Questo è il fiore del partigiano", 
    "Morto per la libertà"]


def get_lyrics_line_length(lyrics):
    lengths = []
    for lyric in lyrics:
        lengths.append(len(lyric))
    return lengths

print(get_lyrics_line_length(lyrics))
print(decorate_text(
    'The get_lyrics_line_length function without the show_even_numbers_only decorator'
    ))


@show_even_numbers_only
def get_lyrics_line_length(lyrics):
    lengths = []
    for lyric in lyrics:
        lengths.append(len(lyric))
    return lengths

print(get_lyrics_line_length(lyrics))
print(decorate_text(
    'The get_lyrics_line_length function with the show_even_numbers_only decorator function'
    ))


# Lambda fuctions
square_it = lambda number: pow(number, 2)
print(square_it(5))
print(decorate_text('The line above is for squaring numbers using a lambda function'))


def sort_by_third(x):
    return x[2]

numbers = [
    [20, 35, 70], [34, 16, 82], [34, 5, 9], [12, 10, 0],
    [10, 82, 15], [72, 63, 30], [76, 6, 7]]
print(sorted(numbers, key=sort_by_third))
print(decorate_text('Sorting using a proper function as the key'))


numbers = [
    [20, 35, 70], [34, 16, 82], [34, 5, 9], [12, 10, 0],
    [10, 82, 15], [72, 63, 30], [76, 6, 7]]
print(sorted(numbers, key=lambda x: x[2]))
print(decorate_text('Sorting using a lambda function as the key'))


# Deep list copy
a = [1, 2, 5]
b = a
b[1] = 10

print(a)
print(b)
print(decorate_text('Doing a deep copy of the list a to b'))

# Shallow list copy
a = [1, 2, 5]
b = a.copy()
b[1] = 10
print(a)
print(b)
print(decorate_text('Doing a shallow copy of the list a to b'))

# Checking some of the methods (functions) or attributes from an object
print(dir(numbers))
print(decorate_text('Some methods and attributes of a Python list'))