Download Python Standard Library (Nutshell Handbooks) by Fredrik Lundh PDF

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By Fredrik Lundh

Python regular Library is a necessary consultant for critical Python programmers. Python is a modular language that imports most beneficial operations from the traditional library (basic aid modules; working approach interfaces; community protocols; dossier codecs; information conversions; threads and approaches; and knowledge storage). you cannot rather software in Python with no utilizing it. during this ebook, writer Fredrik Lundh, author of the Python Imaging Library (PIL), gives you validated, actual documentation of all of the modules within the Python average Library, besides over three hundred annotated instance scripts utilizing the modules. Python regular Library renders this invaluable info in a fresh, easy-to-read structure, but does not speak all the way down to readers. This actual and whole reference documentation is for the Python programmer who wishes the proof and little else. The publication relies at the author's paintings with the Python newsgroup: he reviewed greater than 2500 questions and solutions to that newsgroup so that it will ensure the booklet lined what Python clients fairly desired to recognize. An past model of this e-book has been to be had electronically for over a 12 months, so the cloth has been proven via Python programmers in real-life purposes. This model of Python general Library covers the entire new modules and comparable info for Python 2.0, the 1st new significant unencumber of Python in 4 years.

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It basically tries the pattern at every possible characters position, starting from the left, and returns a match object as soon it has found a match. If the pattern doesn't match anywhere, it returns None. group(0) print date 10 25 95 10 25 95 10/25/95 Python Standard Library: Core Modules 1-44 The sub function can be used to replace patterns with another string. sub("\S+", "-BEEP-", text) you're no entertaining anymore... you-re-no-fun-anymore-BEEP- -BEEP- -BEEP- -BEEP- You can also use sub to replace patterns via a callback function.

UserList()) # instance => NUMBER 'string'> => SEQUENCE 'string'> => SEQUENCE 'list'> => SEQUENCE 'tuple'> => SEQUENCE 'dictionary'> => MAPPING 'builtin_function_or_method'> => CALLABLE 'module'> => 'class'> => CALLABLE 'instance'> => MAPPING NUMBER SEQUENCE Note that the operator module doesn't handle object instances in a sane fashion. In other words, be careful when you use the isNumberType, isMappingType, and isSequenceType functions.

Deepcopy(a) print "before", "=>" print a print b # modify original a[0][0] = 0 a[1] = None print "after", "=>" print a print b before => [[1], [2], [3]] [[1], [2], [3]] after => [[0], None, [3]] [[1], [2], [3]] Python Standard Library: Core Modules 1-51 The sys module This module provides a number of functions and variables that can be used to manipulate different parts of the Python runtime environment. Working with command-line arguments The argv list contains the arguments passed to the script, when the interpreter was started.

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