poros

 def func(msg, numbers):
    print msg
    for x in numbers:
        print x

func("My numbers are:", [0, 1, 2])
"My numbers are:"
0
1
2

poros

def func(arg1, arg2, arg3=10, arg4=0):
  ...
  
# problem
func(1, 2, 10, 0)
# or ?
func(1, 2, 0, 10)

# PYTHON 3 ONLY
def func(arg1, arg2, *, arg3=10, arg4=0):

poros

from collection import defaultdict

class Number(object):
    def __init__(self, N):
        self.N = N
    
    def __repr__(self):
        return str(self.N)

d = defaultdict(Number)

poros

menu = {
  'square': lambda x: x * x,
  'cube': lambda x: x * x * x,
  'half': lambda x: x / 2,
  'double': lambda x: x * 2,
}

command = raw_input()
menu[command](4)

poros

@pytest.fixture
def stream():
    return mock.Mock(spec=Stream)

@pytest.fixture
def output():
    return open('test.txt', 'w')

@pytest.fixture
def tailer(self, stream, output):

poros

def BaseRobot(object):
    def __init__(self):
        assert self.owner

@pytest.fixture
def robot():
    return type('TestRobot', (BaseRobot,), dict(owner='antonio'))()
  
# instead of
def TestRobot(BaseRobot):

poros

test_params = {
    'empty_line': ('', {}),
    'get_ok': ('GET 200', {'request': 'GET', 'status': '200'}),
    'get_not_found': ('GET 404', {'request': 'GET', 'status': '404'}),
}

@pytest.mark.parametrize('line,expected', test_params.values(), ids=test_params.keys())
def test_decode(self, line, expected):
    assert Decoder().decode(line) == expected
    

poros

# raise exception
mock = Mock(side_effect=KeyError('foo'))
mock()
# KeyError: 'foo'


# return value based on argument
values = {'a': 1, 'b': 2, 'c': 3}
def side_effect(arg):
    return values[arg]

poros

wwwlog = open("access-log")
total = 0
for line in wwwlog:
    bytestr = line.rsplit(None,1)[1]
    if bytestr != '-':
        total += int(bytestr)

print "Total", total

poros

import time

def follow(thefile):
    thefile.seek(0,2)
    while True:
        line = thefile.readline()
        if not line:
            time.sleep(0.1)
            continue
        yield line