grihabor

class X:
    def __init__(self):
        self.a = 'a'
    def run(self, b)
        self.b = 'b'

x = X()
x.c = 'c'
x.run('b')
print(x.a, x.b, x.c)

grihabor

class X:
    def __init__(self):
        self.a = 'a'
        self.b = None
        self.c = None
    def run(self, b)
        self.b = b

x = X()
x.c = 'c'

grihabor

class Color:
    def __init__(color, r, g, b):
        color.r = r
        color.g = g
        color.b = b

white = Color(255, 255, 255)
print(white.r, white.g, white.b)
#|255 255 255

grihabor

class Color:
    def __init__(self, r, g, b):
        self.r = r
        self.g = g
        self.b = b
    def __add__(self, other):
        return Color(
            (self.r + other.r) // 2,
            (self.g + other.g) // 2,
            (self.b + other.b) // 2,

grihabor

class Color:
    pass

print(Color)
#|<class '__main__.Color'>

grihabor

class Color:
    pass

empty = Color()
print(empty)
#|<__main__.Color object at 0xf709fff0>

grihabor

from datetime import datetime
import functools

def track_time(f):
    @functools.wraps(f)
    def wrapper(*args, **kwargs):
        start = datetime.now()
        result = f(*args, **kwargs)
        print('Run {}: {}'.format(f.__name__, datetime.now() - start))
        return result

grihabor

from functools import wraps

def print_function_name(f):
    @wraps(f)
    def wrapper(*args, **kwargs):
        print('Call: {}'.format(f.__name__))
        return f(*args, **kwargs)
    return wrapper

@print_function_name

grihabor

select 
  ProductID,
  sum(case 
    when first_order_datetime is null then 0
    else 1
  end)
from order_lines 
left join (
  select 
    min(Datetime) as first_order_datetime,  

grihabor

MAKE               := make --no-print-directory

DESCRIBE           := $(shell git describe --match "v*" --always --tags)
DESCRIBE_PARTS     := $(subst -, ,$(DESCRIBE))

VERSION_TAG        := $(word 1,$(DESCRIBE_PARTS))
COMMITS_SINCE_TAG  := $(word 2,$(DESCRIBE_PARTS))

VERSION            := $(subst v,,$(VERSION_TAG))
VERSION_PARTS      := $(subst ., ,$(VERSION))