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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 on October 30th, 2020 50 plays Content Categories Instructional Recordings Creation Date October 29th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
08:59 Lesson 21.2 Interface Design Lesson 21.2 Interface Design	Lesson 21.2 Interface Design When designing a class, we need to come up with the interface first. In this video we talk about how to do that. We approach this problem returning to our understanding of types: a collection of… class attributes values specification rectangle operations thing worker types interfaces card attribute method interface cards edge bottom hours specifications notion From Hannah Lee on October 30th, 2020 43 plays Content Categories Instructional Recordings Creation Date October 15th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
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 on October 27th, 2020 32 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
05:47 Lesson 19.7 Mutable Table Functions Lesson 19.7 Mutable Table Functions	Lesson 19.7 Mutable Table Functions Dictionaries are mutables and support mutable functions. But this is a case where dictionaries are slightly different from lists. We are allowed to loop over a dictionary as we modify it, so long as… dictionary keys key student ids credit loop function grades net bonus folder statement assignment values dictionaries frame call students modifications From Hannah Lee on October 27th, 2020 29 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
04:32 Lesson 19.5 Dictionaries and For-Loops Lesson 19.5 Dictionaries and For-Loops	Lesson 19.5 Dictionaries and For-Loops Dictionaries are not sliceable, but they are iterable. In this video we show the many different ways you can use a dictionary in a for-loop. The primary thing to understand is that you have to… dictionary loop iterable key values keys dot pairs interval tuple method positions operator range notation brackets d. dictionaries job tool From Hannah Lee on October 27th, 2020 33 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
07:45 Lesson 19.4 Nested Dictionaries Lesson 19.4 Nested Dictionaries	Lesson 19.4 Nested Dictionaries In this video we show that we can nest dictionaries just like we nested lists. In fact, a lot of real world data is represented this way. We show off a particularly complicated JSON file that… dictionary dictionaries json weather key keys fact lists values units visibility hour timestamp things strings string tool airport 31st assignment From Hannah Lee on October 27th, 2020 25 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
06:19 Lesson 19.3 Dictionary Visualization Lesson 19.3 Dictionary Visualization	Lesson 19.3 Dictionary Visualization Since dictionaries are mutable, we must represent them with folders. In this video we show what these folders must look like. In doing so, we see that they look suspiciously similar to other folders… dictionary object color dictionaries objects folder rgb keys values methods python attributes boxes underscores strings key reason range gl method From Hannah Lee on October 27th, 2020 27 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
03:03 Lesson 19.2 Dictionary Assignment Lesson 19.2 Dictionary Assignment	Lesson 19.2 Dictionary Assignment Dictionaries are mutable. In this video we show how to alter there contents. This includes reassigning the value of a dictionary for a given key. But it also includes adding and deleting keys. dictionary key values keys john assignment net statement error things jane contents dictionaries pairs steps alt thing s3 idea operator From Hannah Lee on October 27th, 2020 26 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
07:52 Lesson 19.1 Dictionary Expressions Lesson 19.1 Dictionary Expressions	Lesson 19.1 Dictionary Expressions In this video, we introduce a dictionary as a collection of key-value pairs. We also show how to write a dictionary expression in Python. It looks just like a JSON string, but without the quotes. dictionary key dictionaries keys net values string pairs json lists strings names ids cornell things john assignment fact thing python From Hannah Lee on October 27th, 2020 30 plays Content Categories Instructional Recordings Creation Date October 27th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
05:32 Lesson 16.2 For-Loop Design Lesson 16.2 For-Loop Design	Lesson 16.2 For-Loop Design In this video we show how to use for-loops in function definitions. In particular, we show that we go from a specification to code that uses a for-loop. loop result element answer function integers int body variable 4x alright pseudocode word practice statement lot integer values ints accumulator From Hannah Lee on October 19th, 2020 28 plays Content Categories Instructional Recordings Creation Date October 19th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
06:23 Lesson 15.2 Complex Tuple Expressions Lesson 15.2 Complex Tuple Expressions	Lesson 15.2 Complex Tuple Expressions Tuples are very, very similar to strings. In this video we explore this similarity, showing that they support many of the same operations and methods. tuple strings tuples string boxes thing math types differences times function element operations python expressions values expression iterable int things From Hannah Lee on October 10th, 2020 15 plays Content Categories Instructional Recordings Creation Date October 10th, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
04:54 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 preconditions class attributes invariance classes function color documentation cs intro invariants rgb invariant float dot integers values webpage objects From Hannah Lee on October 2nd, 2020 7 plays Content Categories Instructional Recordings Creation Date October 1st, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
03:47 Lesson 11.1 Objects and Classes Lesson 11.1 Objects and Classes	Lesson 11.1 Objects and Classes In this video we have to introduce some new terminology. We talk about classes, which are new types that are provided by modules (and therefore not built into Python). Objects are the values for… class modules python functions types series parameters point function points values objects classes computer object cases specification distance int videos From Hannah Lee on October 2nd, 2020 8 plays Content Categories Instructional Recordings Creation Date October 1st, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
04:22 Lesson 10.4 Iterative Testing Lesson 10.4 Iterative Testing	Lesson 10.4 Iterative Testing We made very sure that you had learned about testing before you started on your first assignment. That is because we want you testing while you are activtely writing your code, and not waiting until… testing test function answer return print tutor stubbed statement script statements box rule inputs cases techniques values visualization end lines From Hannah Lee on October 2nd, 2020 3 plays Content Categories Instructional Recordings Creation Date October 1st, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
05:13 Lesson 9.6 Conditionals & Call Frames Lesson 9.6 Conditionals & Call Frames	Lesson 9.6 Conditionals & Call Frames Conditionals are typically used inside of function definitions. So how do they affect the way that we draw call frames. We address this issue in this video. You should pay close attention to the… return statement function call instruction counter statements variable tutor functions conditionals indentation frame paper piece definition parameters values variables exams From Hannah Lee on September 24th, 2020 6 plays Content Categories Instructional Recordings Creation Date September 23rd, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search
04:47 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 float restriction string operations sense specification variable condition pre function language restrictions languages definition tools text x. values preconditions From Hannah Lee on September 24th, 2020 5 plays Content Categories Instructional Recordings Creation Date September 23rd, 2020 Creator 1 First Name Walker Creator 1 Last Name White Creator 1 Role Faculty or Staff Member Creator 1 NetID wmw2 Language English Searchable Yes Searchable On Cornell Web Search