book

Python Workout

by Reuven M. Lerner

July 2020

Beginner to intermediate

248 pages

6h 58m

English

Manning Publications

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prefaceacknowledgmentsabout this bookWho should read this bookHow this book is organized: a roadmapAbout the codeSoftware/hardware requirementsliveBook discussion forumabout the authorabout the cover illustration
Useful referencesExercise 1 ■ Number guessing gameWorking it outSolutionScreencast solutionBeyond the exerciseExercise 2 ■ Summing numbersWorking it outSolutionScreencast solutionBeyond the exerciseExercise 3 ■ Run timingWorking it outSolutionScreencast solutionBeyond the exerciseExercise 4 ■ Hexadecimal outputWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Useful referencesExercise 5 ■ Pig LatinWorking it outSolutionScreencast solutionBeyond the exerciseExercise 6 ■ Pig Latin sentenceWorking it outSolutionScreencast solutionBeyond the exerciseExercise 7 ■ Ubbi DubbiWorking it outSolutionScreencast solutionBeyond the exerciseExercise 8 ■ Sorting a stringWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Exercise 9 ■ First-lastWorking it outSolutionScreencast solutionBeyond the exerciseExercise 10 ■ Summing anythingWorking it outSolutionScreencast solutionBeyond the exerciseExercise 11 ■ Alphabetizing namesWorking it outSolutionScreencast solutionBeyond the exerciseExercise 12 ■ Word with most repeated lettersWorking it outSolutionScreencast solutionBeyond the exerciseExercise 13 ■ Printing tuple recordsWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Hashing and dictsSetsExercise 14 ■ RestaurantWorking it outSolutionScreencast solutionBeyond the exerciseExercise 15 ■ RainfallWorking it outSolutionScreencast solutionBeyond the exerciseExercise 16 ■ DictdiffWorking it outSolutionScreencast solutionBeyond the exerciseExercise 17 ■ How many different numbers?Working it outSolutionScreencast solutionBeyond the exerciseSummary

Exercise 18 ■ Final lineWorking it outSolutionScreencast solutionBeyond the exerciseExercise 19 ■ /etc/passwd to dictWorking it outSolutionScreencast solutionBeyond the exerciseExercise 20 ■ Word countWorking it outSolutionScreencast solutionBeyond the exerciseExercise 21 ■ Longest word per fileWorking it outSolutionScreencast solutionBeyond the exerciseExercise 22 ■ Reading and writing CSVWorking it outSolutionScreencast solutionBeyond the exerciseExercise 23 ■ JSONWorking it outSolutionScreencast solutionBeyond the exerciseExercise 24 ■ Reverse linesWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Exercise 25 ■ XML generatorWorking it outSolutionScreencast solutionBeyond the exerciseExercise 26 ■ Prefix notation calculatorWorking it outSolutionScreencast solutionBeyond the exerciseExercise 27 ■ Password generatorWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Exercise 28 ■ Join numbersWorking it outSolutionScreencast solutionBeyond the exerciseExercise 29 ■ Add numbersWorking it outSolutionScreencast solutionBeyond the exerciseExercise 30 ■ Flatten a listWorking it outSolutionScreencast solutionBeyond the exerciseExercise 31 ■ Pig Latin translation of a fileWorking it outSolutionScreencast solutionBeyond the exerciseExercise 32 ■ Flip a dictWorking it outSolutionScreencast solutionBeyond the exerciseExercise 33 ■ Transform valuesWorking it outSolutionScreencast solutionBeyond the exerciseExercise 34 ■ (Almost) supervocalic wordsWorking it outSolutionScreencast solutionBeyond the exerciseExercise 35a ■ Gematria, part 1Working it outSolutionScreencast solutionBeyond the exerciseExercise 35b ■ Gematria, part 2Working it outSolutionScreencast solutionBeyond the exerciseSummary
Exercise 36 ■ Sales taxWorking it outSolutionScreencast solutionBeyond the exerciseExercise 37 ■ MenuWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Exercise 38 ■ Ice cream scoopWorking it outSolutionScreencast solutionBeyond the exerciseExercise 39 ■ Ice cream bowlWorking it outSolutionScreencast solutionBeyond the exerciseExercise 40 ■ Bowl limitsWorking it outSolutionScreencast solutionBeyond the exerciseExercise 41 ■ A bigger bowlWorking it outSolutionScreencast solutionBeyond the exerciseExercise 42 ■ FlexibleDictWorking it outSolutionScreencast solutionBeyond the exerciseExercise 43 ■ AnimalsWorking it outSolutionScreencast solutionBeyond the exerciseExercise 44 ■ CagesWorking it outSolutionScreencast solutionBeyond the exerciseExercise 45 ■ ZooWorking it outSolutionScreencast solutionBeyond the exerciseSummary
Exercise 46 ■ MyEnumerateWorking it outSolutionScreencast solutionBeyond the exerciseExercise 47 ■ CircleWorking it outSolutionScreencast solutionBeyond the exerciseExercise 48 ■ All lines, all filesWorking it outSolutionScreencast solutionBeyond the exerciseExercise 49 ■ Elapsed sinceWorking it outSolutionScreencast solutionBeyond the exerciseExercise 50 ■ MyChainWorking it outSolutionScreencast solutionBeyond the exerciseSummaryConclusion

Content preview from Python Workout

10 Iterators and generators

Have you ever noticed that many Python objects know how to behave inside of a for loop? That’s not an accident. Iteration is so useful, and so common, that Python makes it easy for an object to be iterable. All it has to do is implement a handful of behaviors, known collectively as the iterator protocol.

In this chapter, we’ll explore that protocol and how we can use it to create iterable objects. We’ll do this in three ways:

We’ll create our own iterators via Python classes, directly implementing the protocol ourselves.

We’ll create generators, objects that implement the protocol, based on something that looks very similar to a function. Not surprisingly, these are known as generator functions.

We’ll also create ...