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generators: yield from

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5 Generators II Key terms: PEP Reading: The Hitchhiker's Guide to Python: The Community Reading: David Goodger's Idiomatic Python 5.1 Generator features Assigning from the yield statement even provides a program flow mechanism that c recursion. Rather than diving down into function calls, this style waits to send informatio 5.2 Multiplexing generation The variant yield from introduces yet another layer of abstraction, for yielding anoth generator. This can be used to create recursive generators. yield from, equivalent to code shown in the text of PEP-380. lets generators "delegate" work to each other (ort in general). Delegate file listing in a generator to os.listdir def file_generator (): import OS yield from os.listdir("/") files - file_generator) print (list (files)) 5.3 Parametrized producers Generator functions can also take arguments. Rather than specifying how long to be better to write them with infinite loops and then only consume the number of valt needed. PEP 342 (2005) allow sending values into running generators each time they are awok useful to create coroutines whose output should depend both on parameters and state: Keep a running tally of numbers sent to the coroutine generator. def running_tally(): tally - 0 while True: tally yield yield tally tallier - running_tally() for number in [5, 10, 20, 40): next (tallier) print (tallier.send (number)) Instructor's Notes #5. Write a program to lazily rewrap text from the filename passed so that it fits an 80 column window without breaking any words. Use a generator that yields the next lines of text, each containing as many words as possible & peer review due 3/1