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Functions as Values: Python: Uncharted

Courses PythonFunctions as Values

Functions as Values

Pass functions as data, customize algorithms with callbacks and key functions, build closures that retain state, and return configured behavior from other functions.

Python
Unit 12 of 20
20 lessons
180 min
420 XP

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Lessons

20 total

1Tools That Take ToolsRecognize systems whose behavior is supplied by another tool or function.InteractiveConcept7 min20 XPOpen
2Store It, Pass ItStore a function in a variable, pass it as an argument, and call it through a parameter.CodeConcept8 min20 XPOpen
3Write Your Own repeatWrite repeat(count, callback) so the callback receives each zero-based visit index.CodeConcept9 min20 XPOpen
4Callbacks CustomizeUse different callbacks to customize one apply_to_each traversal.CodeConcept9 min20 XPOpen
5lambda, the Sticky-Note FunctionUse a lambda for one tiny callback and a named function for a multi-step job.CodeConcept8 min20 XPOpen
6sorted with a keySort names by length and price records by their amount field.CodeConcept9 min20 XPOpen
7Sort the RosterSort student dictionaries by score with a lambda key function.CodeConcept9 min20 XPOpen
8min and max with KeysUse key functions to find a number nearest a target and the longest word.CodeConcept8 min20 XPOpen
9Trace the Higher OrderPredict the exact callback arguments, call order, and collected results.InteractiveConcept8 min20 XPOpen
10Build map YourselfRecreate map behavior with a loop, a callback, and a fresh result list.CodeConcept9 min20 XPOpen
11Functions Making FunctionsReturn a multiplier function that remembers the factor used to create it.CodeConcept9 min20 XPOpen
12The BackpackUse a closure to retain and update state after its defining call returns.CodeConcept10 min20 XPOpen
13Two Independent CountersCreate separate closures whose captured counter state advances independently.CodeConcept9 min20 XPOpen
14nonlocal Lets You WriteRepair an UnboundLocalError by declaring a captured name nonlocal before updating it.CodeConcept9 min20 XPOpen
15What Got Captured?Predict values produced by closures with separate captured state.InteractiveConcept8 min20 XPOpen
16Preset Some ArgumentsReturn a pricer closure with a discount rate chosen in advance.CodeConcept10 min20 XPOpen
17Pipeline of StepsReturn a pipeline that applies a supplied list of functions in order.CodeConcept10 min20 XPOpen
18once() and Only OnceReturn a no-argument wrapper that calls an action once and caches its first result.CodePractice10 min20 XPOpen
19Settings MakerReturn formatter closures configured by a prefix and capitalization setting.CodePractice9 min20 XPOpen
20Functions as Values Mastery CheckCompose callbacks, a key function, and a returned closure into a reusable ranked report.CodeMastery check12 min40 XPOpen

Comprehensions Recursion