Core Python Applications Programming, Third Edition (Gal Zentner's Library) by Wesley J. Chun

Author:Wesley J. Chun
Language: eng
Format: epub
Publisher: Prentice Hall
Published: 2012-06-26T16:00:00+00:00

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Line-by-Line Explanation

Lines 1–9

In this script, we use four modules from the standard library. HTMLParser is one of the parsers; the other three are for general use throughout. The second group of imports are of third-party (non-standard library) modules/packages. This ordering is the generally accepted standard for imports: standard library modules/packages first, followed by third-party installations, and finally, any modules/packages local to the application.

Lines 11–17

The URLs variable contains the Web pages to parse; feel free to add, change, or remove URLs here. The output() function takes an iterable of links, removes duplicates by putting them all into a set, sorts them in lexicographic order, and then merges them into a NEWLINE-delimited string that is displayed to the user.

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