Search for tag: "preconditions"

14 Media

Lesson 25.4 The raise Statement duration 6 minutes 4 seconds Lesson 25.4 The raise Statement Lesson 25.4 The raise Statement	Lesson 25.4 The raise Statement Up until now, the only way that we knew how to create an error is with an assert statement. But these always create errors with the type AssertionError. In this video we show how to create errors… error +19 More From Hannah Lee 70 plays
Lesson 24.2 The isinstance Function duration 7 minutes 20 seconds Lesson 24.2 The isinstance Function Lesson 24.2 The isinstance Function	Lesson 24.2 The isinstance Function In this video, we show that we can solve the problem of strict typing by using the isinstance function. This function will be our preferred way for enforcing preconditions going forward. instance +19 More From Hannah Lee 73 plays
Lesson 24.1 Strict Typing duration 5 minutes 52 seconds Lesson 24.1 Strict Typing Lesson 24.1 Strict Typing	Lesson 24.1 Strict Typing Whenever we have enforced preconditions, we have always used the type function. In this video we show why that is a problem, particularly when we want to use an object argument that is a subclass of… fraction +19 More From Hannah Lee 65 plays
Lesson 21.6 Immutable Attributes duration 4 minutes 57 seconds 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 +19 More From Hannah Lee 93 plays
Lesson 21.4 Invariant Enforcement duration 7 minutes 37 seconds 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 +19 More From Hannah Lee 109 plays
Lesson 21.3 Interface Implementation duration 9 minutes 12 seconds 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 +19 More From Hannah Lee 96 plays
Lesson 20.4 Classes Specifications duration 3 minutes 13 seconds Lesson 20.4 Classes Specifications Lesson 20.4 Classes Specifications	Lesson 20.4 Classes Specifications Classes are something we can define. That means we need a specification to tell us what it means for a definition to be correct. In this video we cover the basics of a class specification, and show… class +19 More From Hannah Lee 100 plays
Lesson 17.3 Recursion and the Call Stack duration 9 minutes 7 seconds Lesson 17.3 Recursion and the Call Stack Lesson 17.3 Recursion and the Call Stack	Lesson 17.3 Recursion and the Call Stack Because a recursive function calls itself, it will have multiple call frames on the call stack. In this video we show exactly why we should be concerned about this and why it will affect our function… fibonacci +19 More From Hannah Lee 153 plays
Zoom Oct. 8. Asserts and Error Handling duration 50 minutes 42 seconds Zoom Oct. 8. Asserts and Error Handling Zoom Oct. 8. Asserts and Error Handling	Zoom Oct. 8. Asserts and Error Handling In this session we review how we read error messages in Python. We also show how to both create errors and how to recover from them.Once again, we will spend a significant amount of this class on… error +19 More From Hannah Lee 25 plays
Lesson 13.6 Assert Helpers duration 8 minutes 24 seconds Lesson 13.6 Assert Helpers Lesson 13.6 Assert Helpers	Lesson 13.6 Assert Helpers Sometimes we absolutely need to enforce all of our preconditions, and we cannot live with the compromises of the previous video. In this video we show how to use top-down design to give us more… space +19 More From Hannah Lee 74 plays
Lesson 11.6 Attribute Invariants duration 4 minutes 54 seconds Lesson 11.6 Attribute Invariants Lesson 11.6 Attribute Invariants	Lesson 11.6 Attribute Invariants When you work on Assignment 3, you will discover that the color objects have some significant restrictions on how they can be used. These restrictions are called attribute invariants, and they are… object +19 More From Hannah Lee 118 plays
Lesson 7.4 Preconditions Categories duration 4 minutes 47 seconds Lesson 7.4 Preconditions Categories Lesson 7.4 Preconditions Categories	Lesson 7.4 Preconditions Categories In this video, we break our preconditions up into categories. The primary reason for this is to help us analyze a specification. It will also become extremely imporant when we talk about enforcement… precondition +19 More From Hannah Lee 78 plays
Lesson 7.3 Preconditions duration 4 minutes 12 seconds Lesson 7.3 Preconditions Lesson 7.3 Preconditions	Lesson 7.3 Preconditions The one thing that we have not talked about yet are the preconditions in a specification. However, as this video shows, they are arguably the most important part of the specification. They are what… function +19 More From Hannah Lee 82 plays
CS2110-FA17-05 Session 05 duration 42 minutes 27 seconds CS2110-FA17-05 Session 05 CS2110-FA17-05 Session 05	CS2110-FA17-05 Session 05 2017-09-05 00:00:00+00 computing terminology +55 More From mjp337@cornell.edu 240 plays