By Vernon L. Ceder

The fast Python booklet, moment variation, is a transparent, concise advent to Python three, aimed toward programmers new to Python. This up-to-date variation comprises the entire adjustments in Python three, itself an important shift from previous models of Python. The e-book starts with easy yet invaluable courses that educate the center positive factors of syntax, keep an eye on circulate, and knowledge constructions. It then strikes to bigger purposes regarding code administration, object-oriented programming, net improvement, and changing code from past models of Python. real to his viewers of skilled builders, the writer covers universal programming language positive aspects concisely, whereas giving extra aspect to these positive factors precise to Python.

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The operators (in, +, and *) and built-in functions (len, max, and min) operate on strings as they do on lists and tuples. Index and slice notation works the same for obtaining elements or slices but can’t be used to add, remove, or replace elements. sub(" ", x) 'live and let live' q The re module q provides regular expression functionality. It provides more sophisticated pattern extraction and replacement capability than the string module. The print function outputs strings. 72 w Objects are automatically converted to string representations for printing operator w provides a formatting capability similar to that of C’s sprintf.

When the method is invoked, self is set to the instance that invoked the method. Class Circle inherits from class Shape t. This is similar to but not exactly like a standard class variable y. A class must, in its initializer, explicitly call the initializer of its base class u. The __str__ method is used by the print function i. Other special attribute methods permit operator overloading or are employed by built-in methods such as the length (len) function. move(5,6) >>> print(c2) Circle of radius 5 at 15, 20) q coordinates (0, 0) w coordinates (15, 20) coordinates (20, 26) e The initializer is implicitly called, and a circle instance is created q.

5 >>> 5 // 2 2 >>> 5 % 2 1 >>> 2 ** 8 256 >>> 1000000001 ** 3 1000000003000000003000000001 1 q w e The Python documentation and this book use the term object to refer to instances of any Python data type, not just what many other languages would call class instances. This is because all Python objects are instances of one class or another. x), and division of integers with // w results in truncation. Note that integers are of unlimited size e; they will grow as large as you need them to. 0 q Complex numbers consist of both a real element and an imaginary element, suffixed with a j.

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