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Commit 6e4c490

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闭包,装饰器
1 parent a1bba1c commit 6e4c490

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6 files changed

+261
-0
lines changed

6 files changed

+261
-0
lines changed

‎07-closure-deco/average.py‎

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# -*- coding: utf-8 -*-
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class Averager:
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def __init__(self):
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self.series = []
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def __call__(self, new_value):
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self.series.append(new_value)
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total = sum(self.series)
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return total / len(self.series)
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def make_averager_v1():
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series = []
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def averager(new_value):
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series.append(new_value)
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total = sum(series)
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return total / len(series)
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return averager
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def make_averager_v2():
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count = 0
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total = 0
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def averager(new_value):
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nonlocal count, total
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count += 1
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total += new_value
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return total / count
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return averager

‎07-closure-deco/clockdeco.py‎

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# -*- coding: utf-8 -*-
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import time
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import functools
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def clock1(func):
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"""hello"""
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def clocked(*args):
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"""world"""
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t0 = time.time()
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result = func(*args)
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elapsed = time.time() - t0
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name = func.__name__
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arg_str = ', '.join(repr(arg) for arg in args)
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print('[%0.8fs] %s(%s) -> %r' % (elapsed, name, arg_str, result))
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return result
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return clocked
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# 改进的版本
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def clock(func):
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@functools.wraps(func)
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def clocked(*args, **kwargs):
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t0 = time.time()
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result = func(*args, **kwargs)
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elapsed = time.time() - t0
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name = func.__name__
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arg_lst = []
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if args:
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arg_lst.append(', '.join(repr(arg) for arg in args))
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if kwargs:
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pairs = ['%s=%r' % (k, w) for k, w in sorted(kwargs.items())]
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arg_lst.append(', '.join(pairs))
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arg_str = ', '.join(arg_lst)
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print('[%0.8fs] %s(%s) -> %r' % (elapsed, name, arg_str, result))
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return result
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return clocked
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@clock
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def snooze(seconds):
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time.sleep(seconds)
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@clock
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def factorial(n):
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"""计算n的阶乘"""
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return 1 if n < 2 else n * factorial(n - 1)
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if __name__ == '__main__':
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print('*' * 40, 'Calling snooze(.123)')
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snooze(.123)
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print('*' * 40, 'Calling factorial(6)')
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print('6! =', factorial(6))
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print(factorial.__name__)
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print(factorial.__doc__)

‎07-closure-deco/fibo.py‎

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# -*- coding: utf-8 -*-
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import functools
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from clockdeco import clock
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@clock
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def fibonacci_slow(n):
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if n < 2:
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return n
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return fibonacci_slow(n - 2) + fibonacci_slow(n - 1)
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# 使用缓存,速度更快
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@functools.lru_cache()
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@clock
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def fibonacci(n):
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if n < 2:
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return n
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return fibonacci(n - 2) + fibonacci(n - 1)
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if __name__ == '__main__':
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print(fibonacci(10))

‎07-closure-deco/generic.py‎

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# -*- coding: utf-8 -*-
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from functools import singledispatch
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from collections import abc
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import numbers
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import html
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@singledispatch
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def htmlize(obj):
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content = html.escape(repr(obj))
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return f'<pre>{content}</pre>'
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@htmlize.register(str)
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def _(text):
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content = html.escape(text).replace('\n', '<br>\n')
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return f'<p>{content}</p>'
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@htmlize.register(numbers.Integral)
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def _(n):
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return f'<pre>{n} (0x{n:x})</pre>'
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@htmlize.register(tuple)
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@htmlize.register(abc.MutableSequence)
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def _(seq):
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inner = '</li>\n<li>'.join(htmlize(item) for item in seq)
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return '<ul>\n<li>' + inner + '</li>\n</ul>'

‎07-closure-deco/registration.py‎

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# -*- coding: utf-8 -*-
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registry = []
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def register(func):
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print('running register(%s)' % func)
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registry.append(func)
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return func
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@register
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def f1():
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print('running f1()')
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@register
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def f2():
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print('running f2()')
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def f3():
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print('running f3()')
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def main():
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print('running main()')
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print('registry ->', registry)
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f1()
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f2()
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f3()
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if __name__ == '__main__':
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main()

‎07-closure-deco/strategy.py‎

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# -*- coding: utf-8 -*-
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from collections import namedtuple
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Customer = namedtuple('Customer', 'name fidelity')
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class LineItem:
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def __init__(self, product, quantity, price):
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self.product = product
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self.quantity = quantity
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self.price = price
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def total(self):
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return self.price * self.quantity
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class Order:
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def __init__(self, customer, cart, promotion=None):
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self.customer = customer
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self.cart = list(cart)
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self.promotion = promotion
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def total(self):
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if not hasattr(self, '__total'):
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self.__total = sum(item.total() for item in self.cart)
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return self.__total
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def due(self):
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if self.promotion is None:
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discount = 0
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else:
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discount = self.promotion(self)
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return self.total() - discount
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def __repr__(self):
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fmt = '<Order total: {:.2f} due: {:.2f}>'
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return fmt.format(self.total(), self.due())
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# best promotion version 4
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promos = []
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def promotion(promo_func):
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promos.append(promo_func)
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return promo_func
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@promotion
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def fidelity_promo(order):
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"""5% discount for customers with 1000 or more fidelity points"""
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return order.total() * 0.05 if order.customer.fidelity >= 1000 else 0
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@promotion
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def bulk_item_promo(order):
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"""10% discount for each LineItem with 20 or more units"""
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discount = 0
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for item in order.cart:
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if item.quantity >= 20:
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discount += item.total() * 0.1
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return discount
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@promotion
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def large_order_promo(order):
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"""7% discount for orders with 10 or more distinct items"""
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distinct_items = {item.product for item in order.cart}
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if len(distinct_items) >= 10:
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return order.total() * 0.07
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return 0
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def best_promo(order):
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"""Select best discount available"""
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return max(promo(order) for promo in promos)

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