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Commit b7c6e70

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class func
1 parent 67c1a0e commit b7c6e70

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4 files changed

+129
-0
lines changed

4 files changed

+129
-0
lines changed

‎05-1class-func/bingocall.py‎

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# -*- coding: utf-8 -*-
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import random
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class BingoCage:
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def __init__(self, items):
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self._items = list(items)
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random.shuffle(self._items)
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def pick(self):
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try:
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return self._items.pop()
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except IndexError:
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raise LookupError('pick from empty BingoCage')
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def __call__(self):
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return self.pick()

‎05-1class-func/clip.py‎

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# -*- coding: utf-8 -*-
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def clip(text: str, max_len: 'int > 0'=80) -> str:
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"""Return text clipped at the last space before or after max_len"""
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end = None
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if len(text) > max_len:
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space_before = text.rfind(' ', 0, max_len)
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if space_before > 0:
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end = space_before
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else:
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space_after = text.rfind(' ', max_len)
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if space_after >= 0:
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end = space_after
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if end is None:
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end = len(text)
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return text[:end].rstrip()

‎05-1class-func/tagger.py‎

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# -*- coding: utf-8 -*-
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def tag(tag_name, *content, cls=None, **attrs):
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"""Generate one or more HTML tags"""
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if cls is not None:
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attrs['class'] = cls
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if attrs:
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attr_str = ''.join(' %s="%s"' % (attr, value)
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for attr, value in sorted(attrs.items()))
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else:
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attr_str = ''
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if content:
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return '\n'.join('<%s%s>%s<%s>' % (tag_name, attr_str, c, tag_name)
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for c in content)
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else:
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return '<%s%s />' % (tag_name, attr_str)
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# -*- coding: utf-8 -*-
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from abc import ABC, abstractmethod
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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.discount(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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class Promotion(ABC):
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@abstractmethod
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def discount(self, order):
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"Return discount as a positive dollar amount"
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class FidelityPromo(Promotion):
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"""5% discount for customers with 1000 or more fidelity points"""
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def discount(self, order):
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return order.total() * 0.05 if order.customer.fidelity >= 1000 else 0
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class BulkItemPromo(Promotion):
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"""10% discount for each LineItem with 20 or more units"""
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def discount(self, order):
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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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class LargeOrderPromo(Promotion):
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"""7% discount for orders with 10 or more distinct items"""
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def discount(self, order):
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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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