# Fatorial implemented with recursion

def factorial(num):

    if num <= 1:
        return 1
    else:
        return(num * factorial(num - 1))

# Testing factorial()
print factorial(5)

def fatorial(n):

    n = n if n > 1 else 1
    j = 1
    for i in range(1, n + 1):
        j = j * i
    return j

# Testing...
for i in range(1, 6):
    print i, '->', fatorial(i)

def fib(n):
    """Fibonacci:
    fib(n) = fib(n - 1) + fib(n - 2) se n > 1
    fib(n) = 1 se n <= 1
    """
    if n > 1:
        return fib(n - 1) + fib(n - 2)
    else:
        return 1

# Show Fibonacci from 1 to 5
for i in [1, 2, 3, 4, 5]:
    print i, '=>', fib(i)

def fib(n):
    """Fibonacci:
    fib(n) = fib(n - 1) + fib(n - 2) se n > 1
    fib(n) = 1 se n <= 1
    """
    
    # the first two values
    l = [1, 1]
    
    # Calculating the others
    for i in range(2, n + 1):
        l.append(l[i -1] + l[i - 2])
        
    return l[n]

# Show Fibonacci from 1 to 5
for i in [1, 2, 3, 4, 5]:
    print i, '=>', fib(i)

def rgb_html(r=0, g=0, b=0):
    """Converts R, G, B to #RRGGBB"""

    return '#%02x%02x%02x' % (r, g, b)

def html_rgb(color='#000000'):
    """Converts #RRGGBB em R, G, B"""

    if color.startswith('#'): color = color[1:]

    r = int(color[:2], 16)
    g = int(color[2:4], 16)
    b = int(color[4:], 16)

    return r, g, b # a sequence

print rgb_html(200, 200, 255)
print rgb_html(b=200, g=200, r=255) # what's happened? 
print html_rgb('#c8c8ff')

# *args - arguments without name (list)
# **kargs - arguments with name (ditcionary)

def func(*args, **kargs):
    print args
    print kargs

func('weigh', 10, unit='k')

data = [(4, 3), (5, 1), (7, 2), (9, 0)]

# Comparing by the last element
def _cmp(x, y):
    return cmp(x[-1], y[-1])

print 'List:', data

# Ordering using  _cmp()
print 'Ordered:', sorted(data, _cmp)

print eval('12. / 2 + 3.3')