init

chapter1/abstract_factory.py

@@ -0,0 +1,107 @@
+class Frog:
+
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self):
+        return self.name
+
+    def interact_with(self, obstacle):
+        print('{} the Frog encounters {} and {}!'.format(self,
+                                                         obstacle, obstacle.action()))
+
+
+class Bug:
+
+    def __str__(self):
+        return 'a bug'
+
+    def action(self):
+        return 'eats it'
+
+
+class FrogWorld:
+
+    def __init__(self, name):
+        print(self)
+        self.player_name = name
+
+    def __str__(self):
+        return '\n\n\t------ Frog World ———'
+
+    def make_character(self):
+        return Frog(self.player_name)
+
+    def make_obstacle(self):
+        return Bug()
+
+
+class Wizard:
+
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self):
+        return self.name
+
+    def interact_with(self, obstacle):
+        print('{} the Wizard battles against {} and {}!'.format(self, obstacle, obstacle.action()))
+
+
+class Ork:
+
+    def __str__(self):
+        return 'an evil ork'
+
+    def action(self):
+        return 'kills it'
+
+
+class WizardWorld:
+
+    def __init__(self, name):
+        print(self)
+        self.player_name = name
+
+    def __str__(self):
+        return '\n\n\t------ Wizard World ———'
+
+    def make_character(self):
+        return Wizard(self.player_name)
+
+    def make_obstacle(self):
+        return Ork()
+
+
+class GameEnvironment:
+
+    def __init__(self, factory):
+        self.hero = factory.make_character()
+        self.obstacle = factory.make_obstacle()
+
+    def play(self):
+        self.hero.interact_with(self.obstacle)
+
+
+def validate_age(name):
+    try:
+        age = input('Welcome {}. How old are you? '.format(name))
+        age = int(age)
+    except ValueError as err:
+        print("Age {} is invalid, please try \
+        again…".format(age))
+        return (False, age)
+    return (True, age)
+
+
+def main():
+    name = input("Hello. What's your name? ")
+    valid_input = False
+    while not valid_input:
+        valid_input, age = validate_age(name)
+    game = FrogWorld if age < 18 else WizardWorld
+    environment = GameEnvironment(game(name))
+    environment.play()
+
+if __name__ == '__main__':
+    main()

chapter1/data/donut.json

@@ -0,0 +1,130 @@
+[
+    {
+        "id": "0001",
+        "type": "donut",
+        "name": "Cake",
+        "ppu": 0.55,
+        "batters": {
+            "batter": [
+                {
+                    "id": "1001",
+                    "type": "Regular"
+                },
+                {
+                    "id": "1002",
+                    "type": "Chocolate"
+                },
+                {
+                    "id": "1003",
+                    "type": "Blueberry"
+                },
+                {
+                    "id": "1004",
+                    "type": "Devil's Food"
+                }
+            ]
+        },
+        "topping": [
+            {
+                "id": "5001",
+                "type": "None"
+            },
+            {
+                "id": "5002",
+                "type": "Glazed"
+            },
+            {
+                "id": "5005",
+                "type": "Sugar"
+            },
+            {
+                "id": "5007",
+                "type": "Powdered Sugar"
+            },
+            {
+                "id": "5006",
+                "type": "Chocolate with Sprinkles"
+            },
+            {
+                "id": "5003",
+                "type": "Chocolate"
+            },
+            {
+                "id": "5004",
+                "type": "Maple"
+            }
+        ]
+    },
+    {
+        "id": "0002",
+        "type": "donut",
+        "name": "Raised",
+        "ppu": 0.55,
+        "batters": {
+            "batter": [
+                {
+                    "id": "1001",
+                    "type": "Regular"
+                }
+            ]
+        },
+        "topping": [
+            {
+                "id": "5001",
+                "type": "None"
+            },
+            {
+                "id": "5002",
+                "type": "Glazed"
+            },
+            {
+                "id": "5005",
+                "type": "Sugar"
+            },
+            {
+                "id": "5003",
+                "type": "Chocolate"
+            },
+            {
+                "id": "5004",
+                "type": "Maple"
+            }
+        ]
+    },
+    {
+        "id": "0003",
+        "type": "donut",
+        "name": "Old Fashioned",
+        "ppu": 0.55,
+        "batters": {
+            "batter": [
+                {
+                    "id": "1001",
+                    "type": "Regular"
+                },
+                {
+                    "id": "1002",
+                    "type": "Chocolate"
+                }
+            ]
+        },
+        "topping": [
+            {
+                "id": "5001",
+                "type": "None"
+            },
+            {
+                "id": "5002",
+                "type": "Glazed"
+            },
+            {
+                "id": "5003",
+                "type": "Chocolate"
+            },
+            {
+                "id": "5004",
+                "type": "Maple"
+            }
+        ]
+    }
+]

chapter1/data/person.xml

@@ -0,0 +1,55 @@
+<persons>
+     <person>
+       <firstName>John</firstName>
+       <lastName>Smith</lastName>
+       <age>25</age>
+       <address>
+         <streetAddress>21 2nd Street</streetAddress>
+         <city>New York</city>
+         <state>NY</state>
+         <postalCode>10021</postalCode>
+       </address>
+       <phoneNumbers>
+         <phoneNumber type="home">212 555-1234</phoneNumber>
+         <phoneNumber type="fax">646 555-4567</phoneNumber>
+       </phoneNumbers>
+       <gender>
+         <type>male</type>
+       </gender>
+     </person>
+     <person>
+       <firstName>Jimy</firstName>
+       <lastName>Liar</lastName>
+    <age>19</age>
+    <address>
+      <streetAddress>18 2nd Street</streetAddress>
+      <city>New York</city>
+      <state>NY</state>
+      <postalCode>10021</postalCode>
+    </address>
+    <phoneNumbers>
+      <phoneNumber type="home">212 555-1234</phoneNumber>
+    </phoneNumbers>
+    <gender>
+      <type>male</type>
+    </gender>
+  </person>
+  <person>
+    <firstName>Patty</firstName>
+    <lastName>Liar</lastName>
+    <age>20</age>
+    <address>
+      <streetAddress>18 2nd Street</streetAddress>
+      <city>New York</city>
+      <state>NY</state>
+      <postalCode>10021</postalCode>
+    </address>
+    <phoneNumbers>
+      <phoneNumber type="home">212 555-1234</phoneNumber>
+      <phoneNumber type="mobile">001 452-8819</phoneNumber>
+    </phoneNumbers>
+    <gender>
+      <type>female</type>
+    </gender>
+  </person>
+</persons>

chapter1/factory_method.py

@@ -0,0 +1,72 @@
+import xml.etree.ElementTree as etree
+import json
+
+
+class JSONConnector:
+
+    def __init__(self, filepath):
+        self.data = dict()
+        with open(filepath, mode='r', encoding='utf-8') as f:
+            self.data = json.load(f)
+
+    @property
+    def parsed_data(self):
+        return self.data
+
+
+class XMLConnector:
+
+    def __init__(self, filepath):
+        self.tree = etree.parse(filepath)
+
+    @property
+    def parsed_data(self):
+        return self.tree
+
+
+def connection_factory(filepath):
+    if filepath.endswith('json'):
+        connector = JSONConnector
+    elif filepath.endswith('xml'):
+        connector = XMLConnector
+    else:
+        raise ValueError('Cannot connect to {}'.format(filepath))
+    return connector(filepath)
+
+
+def connect_to(filepath):
+    factory = None
+    try:
+        factory = connection_factory(filepath)
+    except ValueError as ve:
+        print(ve)
+    return factory
+
+
+def main():
+    sqlite_factory = connect_to('data/person.sq3')
+    print()
+
+    xml_factory = connect_to('data/person.xml')
+    xml_data = xml_factory.parsed_data
+    liars = xml_data.findall(".//{}[{}='{}']".format('person',
+                                                     'lastName', 'Liar'))
+    print('found: {} persons'.format(len(liars)))
+    for liar in liars:
+        print('first name: {}'.format(liar.find('firstName').text))
+        print('last name: {}'.format(liar.find('lastName').text))
+        [print('phone number ({})'.format(p.attrib['type']),
+               p.text) for p in liar.find('phoneNumbers')]
+
+    print()
+
+    json_factory = connect_to('data/donut.json')
+    json_data = json_factory.parsed_data
+    print('found: {} donuts'.format(len(json_data)))
+    for donut in json_data:
+        print('name: {}'.format(donut['name']))
+        print('price: ${}'.format(donut['ppu']))
+        [print('topping: {} {}'.format(t['id'], t['type'])) for t in donut['topping']]
+
+if __name__ == '__main__':
+    main()

chapter1/id.py

@@ -0,0 +1,9 @@
+class A(object):
+    pass
+
+if __name__ == '__main__':
+    a = A()
+    b = A()
+
+    print(id(a) == id(b))
+    print(a, b)