Download Fluent Python by Luciano Ramalho PDF

April 4, 2017 | Programming | By admin | 0 Comments

By Luciano Ramalho

Python s simplicity enables you to develop into effective fast, yet this usually skill you aren't utilizing every little thing it has to supply. With this hands-on advisor, you ll tips on how to write potent, idiomatic Python code by means of leveraging its most sensible and doubtless such a lot ignored gains. writer Luciano Ramalho takes you thru Python s middle language good points and libraries, and indicates you the way to make your code shorter, swifter, and extra readable on the related time.

Many skilled programmers attempt to bend Python to slot styles they discovered from different languages, and not become aware of Python gains outdoors in their adventure. With this ebook, these Python programmers will completely how you can turn into expert in Python 3.

This booklet covers:
• Python info version: know the way certain tools are the foremost to the constant habit of objects
• information constructions: take complete benefit of integrated forms, and comprehend the textual content vs bytes duality within the Unicode age
• services as items: view Python services as first class gadgets, and know the way this impacts renowned layout patterns
• Object-oriented idioms: construct sessions by means of studying approximately references, mutability, interfaces, operator overloading, and a number of inheritance
• keep watch over stream: leverage context managers, turbines, coroutines, and concurrency with the concurrent.futures and asyncio packages
• Metaprogramming: know the way houses, characteristic descriptors, type decorators, and metaclasses paintings

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Sample text

But thanks to the special method __len__, you can also make len work with your own custom objects. This is a fair compromise between the need for efficient built-in objects and the consistency of the language. ” If you think of abs and len as unary operators, you may be more inclined to forgive their functional look-and-feel, as opposed to the method call syntax one might expect in an OO language. In fact, the ABC language—a direct ancestor of Python that pio‐ neered many of its features—had an # operator that was the equivalent of len (you’d write #s).

To concatenate multiple copies of the same sequence, multiply it by an integer. Again, a new sequence is created: >>> l = [1, 2, 3] >>> l * 5 [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3] 36 | Chapter 2: An Array of Sequences >>> 5 * 'abcd' 'abcdabcdabcdabcdabcd' Both + and * always create a new object, and never change their operands. Beware of expressions like a * n when a is a sequence contain‐ ing mutable items because the result may surprise you. For exam‐ ple, trying to initialize a list of lists as my_list = [[]] * 3 will result in a list with three references to the same inner list, which is probably not what you want.

Print('%s/%s' % passport) ... BRA/CE342567 ESP/XDA205856 USA/31195855 >>> for country, _ in traveler_ids: ... print(country) ... USA BRA ESP Latitude and longitude of the Los Angeles International Airport. Data about Tokyo: name, year, population (millions), population change (%), area (km²). A list of tuples of the form (country_code, passport_number). As we iterate over the list, passport is bound to each tuple. The % formatting operator understands tuples and treats each item as a separate field.

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