随笔分类 -  Python Learning

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Class diagrams
摘要：So far we have seen stack diagrams, which show the state of a program, and object diagrams, which show the attributes of an object and their values. T... 阅读全文
posted @ 2014-10-06 18:48 平静缓和用胸音说爱 阅读(346) 评论(0) 推荐(0)
Inheritance
摘要：The language feature most often associated with object-oriented programming is inheritance. Inheritance is the ability to define a new class that is a... 阅读全文
posted @ 2014-10-06 18:10 平静缓和用胸音说爱 阅读(416) 评论(0) 推荐(0)
Add, remove, shuffle and sort
摘要：To deal cards, we would like a method that removes a card from the deck and returns it. The list method pop provides a convenient way to do that. Sinc... 阅读全文
posted @ 2014-10-06 17:33 平静缓和用胸音说爱 阅读(267) 评论(0) 推荐(0)
Decks
摘要：Now that we have Card objects, the next step is to define a class to represent decks. Since a deck is made up cards, a natural choice is for each Deck... 阅读全文
posted @ 2014-10-06 14:17 平静缓和用胸音说爱 阅读(274) 评论(0) 推荐(0)
Comparing cards
摘要：For built-in types, there are conditional operators (, ==, etc.) that compare values and determine when one is greater than, less than, or equal to an... 阅读全文
posted @ 2014-10-06 13:55 平静缓和用胸音说爱 阅读(186) 评论(0) 推荐(0)
Class attributes
摘要：In order to print Card objects in a way that people can easily read, we need a mapping from the integer codes to the corresponding ranks and suits. A ... 阅读全文
posted @ 2014-10-03 14:25 平静缓和用胸音说爱 阅读(243) 评论(0) 推荐(0)
Card objects
摘要：There are fifty-two cards in a deck, each of which belongs to one of four suits and one of thirteen ranks. The suits are Spades, Hearts, Diamonds, and... 阅读全文
posted @ 2014-10-03 13:29 平静缓和用胸音说爱 阅读(195) 评论(0) 推荐(0)
Exercises - Kangaroo
摘要：Write a definition for a class named Kangaroo with the following methods:An __init__ method that initializes an attribute named pouch_contents to an e... 阅读全文
posted @ 2014-10-03 12:56 平静缓和用胸音说爱 阅读(191) 评论(0) 推荐(0)
Type-base dispatch
摘要：In the previous section we added two Time objects, but you also might want to add an integer to a Time object. The following is an alternative version... 阅读全文
posted @ 2014-10-02 22:23 平静缓和用胸音说爱 阅读(206) 评论(0) 推荐(0)
Operator overloading
摘要：By defining other special methods, you can specify the behavior of operators on user-defined types. For example, if you define add method for the Time... 阅读全文
posted @ 2014-10-02 20:52 平静缓和用胸音说爱 阅读(243) 评论(0) 推荐(0)
The str method
摘要：__str__ is a special method name, like __init__, that is supposed to return a string representation of an object.For example, here is a str method for... 阅读全文
posted @ 2014-10-02 20:23 平静缓和用胸音说爱 阅读(222) 评论(0) 推荐(0)
The init method
摘要：The init method is a special method that gets invoked when an object is instantiated. Its full name is __init__ (two underscore characters, followed b... 阅读全文
posted @ 2014-10-02 15:59 平静缓和用胸音说爱 阅读(205) 评论(0) 推荐(0)
Object-oriented features
摘要：Python is an object-oriented programing language, which means that it provides features that support object-oriented programming. It is easy to define... 阅读全文
posted @ 2014-10-02 15:27 平静缓和用胸音说爱 阅读(282) 评论(0) 推荐(0)
Modifiers
摘要：Sometimes it is useful for a function to modify the objects it gets as parameters. In that case, the changes are visible to the caller. increment, whi... 阅读全文
posted @ 2014-10-02 13:12 平静缓和用胸音说爱 阅读(304) 评论(0) 推荐(0)
Pure functions
摘要：In the next few sections, we’ll write two versions of a function called add_time, which calculates the sum of two Time objects. They demonstrate two k... 阅读全文
posted @ 2014-10-02 11:01 平静缓和用胸音说爱 阅读(190) 评论(0) 推荐(0)
Classes and functions
摘要：As another example of a user-defined type, we’ll define a class called Time that records the time of day. The class definition looks like this: ... 阅读全文
posted @ 2014-10-01 18:00 平静缓和用胸音说爱 阅读(274) 评论(0) 推荐(0)
Copying
摘要：Aliasing can make program difficult to read because changes made in one place might have unexpected effects in another place. It is hard to keep track... 阅读全文
posted @ 2014-09-30 00:13 平静缓和用胸音说爱 阅读(294) 评论(0) 推荐(0)
Objects are mutable
摘要：We can change the state of an object by making an assignment to one of its attributes. For example, to change the size of a rectangle without changing... 阅读全文
posted @ 2014-09-29 23:17 平静缓和用胸音说爱 阅读(179) 评论(0) 推荐(0)
Rectangles
摘要：Sometimes it is obvious what the attributes of an object should be, but other times you have to make decisions. For examples, imagine you are designin... 阅读全文
posted @ 2014-09-25 15:47 平静缓和用胸音说爱 阅读(314) 评论(0) 推荐(0)
Attributes
摘要：You can assign values to an instance using dot notation. This syntax for selecting a variable from a module, such as math.pi or string.uppercase. In t... 阅读全文
posted @ 2014-09-25 14:58 平静缓和用胸音说爱 阅读(279) 评论(0) 推荐(0)

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