Search for tag: "initializer"

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11:04 Lesson 27.3 The GameApp Class Lesson 27.3 The GameApp Class	Lesson 27.3 The GameApp Class In this video we introduce the GameApp class, which is a class written by your instructor. In the last assignment you will be creating a subclass of the class to run your game. This video highlights… game thing class method ellipse angle window things update methods screen attributes object position documentation animation app lips initializer subclass From Hannah Lee 82 plays
04:22 Lesson 25.5 Custom Error Types Lesson 25.5 Custom Error Types	Lesson 25.5 Custom Error Types Now that we can raise an error of any type, it is time to make our own error types. In this video we show that this is incredibly simple, and needs almost no code. error exception custom class types initializer errors object argument base folder attributes methods pass header thing recovers arithmetic parent subclass From Hannah Lee 56 plays
11:36 Lesson 23.7 Class Methods Lesson 23.7 Class Methods	Lesson 23.7 Class Methods Operator overloading is not the only important abstraction tool. In this video we introduce the concept of class methods, which are necessary to add new constructors to a class. These new… matrix class method constructor math rotation point thing methods matrices object triangle subclass parameter word table initializer python reference things From Hannah Lee 73 plays
09:07 Lesson 22.8 Subclass Initializers Lesson 22.8 Subclass Initializers	Lesson 22.8 Subclass Initializers In this video we show that thte primary purpose of the super function is in the initializer method of the subclass. That is because we cannot guarantee that all of the attributes for the parent class… initializer bonus executive attribute salary employee attributes setters class module method getter helper problem tutor things thing methods getters setter From Hannah Lee 60 plays
09:13 Lesson 22.6 Method Overriding Lesson 22.6 Method Overriding	Lesson 22.6 Method Overriding Subclasses inherit all of the methods of their parent. But suppose you do not want to use the inherited version of a method, but want to define a new one instead? In this video we talk about the… employee string executive method initializer class salary function helper attributes str object question bonus underscore subclasses whoa thing folder constructor From Hannah Lee 63 plays
53:20 Zoom Oct. 29. Classes Zoom Oct. 29. Classes	Zoom Oct. 29. Classes In this presentation, we review the class definition. We look at both the syntax (what must be present for the definition to work) and the semantics (how it is processed in Python).Most of this class… class call folder assignment thing step constructor method tutor things function initializer lot definition module parameters question alright classes majority From Hannah Lee 23 plays
04:57 Lesson 21.6 Immutable Attributes Lesson 21.6 Immutable Attributes	Lesson 21.6 Immutable Attributes Getters and setters have another advantage in that they allow us to completely disable to any changes to an attribute. This allows us to separate attributes into mutable and immutable attributes,… attribute person turtle setter attributes setters getters initializer class things definition preconditions getter alright underscore distinction error fact statement assignment From Hannah Lee 80 plays
07:37 Lesson 21.4 Invariant Enforcement Lesson 21.4 Invariant Enforcement	Lesson 21.4 Invariant Enforcement We know how to enforce preconditions, but how do we force invariants for our attributes? As we see in this video, we do it much the same as for preconditions. But that is because we are going to… preconditions methods class attributes precondition statements invariance method hour purpose object getter programmer minute initializer attribute setter problem invariants values From Hannah Lee 90 plays
09:12 Lesson 21.3 Interface Implementation Lesson 21.3 Interface Implementation	Lesson 21.3 Interface Implementation Once you have the interface to a class, it is time to start writing code. As we see in this video, the idea is much the same as writing functions. However, attributes – and specifically… class minutes method invariant hours object attributes specification invariance preconditions function parameter hour invariants methods percent initializer attribute precondition responsibility From Hannah Lee 80 plays
05:49 Lesson 21.1 Interface vs Implementation Lesson 21.1 Interface vs Implementation	Lesson 21.1 Interface vs Implementation When we implement (or define) a function, we are given a specification and we complete the rest of the body to match the specification. We will do the same thing for classes as well. But as we see in… class specification method interface functions implementation definition object methods classes specifications initializer attributes function definitions docstring afternoon conditions minute editor From Hannah Lee 109 plays
10:03 Lesson 20.10 Representation Methods Lesson 20.10 Representation Methods	Lesson 20.10 Representation Methods When we first introduced objects, we talked about the concept of object representation. But how does Python know how to use this representation. In this video, we see that this is the result of… string function class object helper underscore worker python methods initializer wrapper point purpose things method repr representation str repre tuple From Hannah Lee 68 plays
09:34 Lesson 20.9 Optional Arguments Lesson 20.9 Optional Arguments	Lesson 20.9 Optional Arguments Unlike other programming languages, a Python class has only one constructor, If we want to give the user more flexibility when creating objects, we should make certain arguments optional. In this… arguments default call parameters initializer constructor assignment folder class point python statement parameter values thing method functions y. tutor module From Hannah Lee 74 plays
04:53 Lesson 20.8 The None Value Lesson 20.8 The None Value	Lesson 20.8 The None Value We have seen the None value used in several previous videos. But in this video we finally introduce it formally. In particular, we show why it is so commonly used in object initialization. attributes boss object worker attribute variable constructor class walker deal box fact initializer folder error objects variables purpose module attention From Hannah Lee 72 plays
09:31 Lesson 20.7 Intializers Lesson 20.7 Intializers	Lesson 20.7 Intializers In this video, we introduce the most important method definition in any class: the initializer. The initializer is responsible for creating all the attributes so that the user does not need to worry… call frame constructor worker folder class initializer arguments method object python boss return tutor attribute knit definition parameters parameter function From Hannah Lee 97 plays