By Kenneth Lambert

ISBN-10: 1285752015

ISBN-13: 9781285752013

Written for computing device programming scholars, hobbyists, and pros, basics OF PYTHON: info buildings is an advent to object-oriented layout and knowledge constructions utilizing the preferred Python programming language. the extent of guide assumes not less than one semester of programming in an object-oriented language akin to Java, C++, or Python. during the step by step guide and workouts during this ebook, you'll disguise such subject matters because the layout of assortment sessions with polymorphism and inheritance, a number of implementations of assortment interfaces, and the research of the space/time tradeoffs of alternative assortment implementations (specifically array-based implementations and link-based implementations). Collections lined contain units, lists, stacks, queues, bushes, dictionaries, and graphs. prepare to dig into Python facts constructions with basics OF PYTHON: information constructions.

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Close() Failure to close an output file can result in data being lost. Writing Numbers to a Text File The file method write expects a string as an argument. Therefore, other types of data, such as integers or floating-point numbers, must first be converted to strings before being written to an output file. In Python, the values of most data types can be converted to strings by using the str function. The resulting strings are then written to a file with a space or a newline as a separator character.

Startswith("great") # Returns False # Returns "GREATER" # Returns True If you try to run a method that an object does not recognize, Python raises an exception and halts the program. To discover the set of methods that an object recognizes, you run Python’s dir function, in the Python shell, with the object’s type as an argument. For example, dir(str) returns a list of the names of the methods recognized by string objects. upper. Some method names, such as __add__ and __len__, are run when Python sees an object used with certain operators or functions.

Linear Collections The items in a linear collection, like people in a line, are ordered by position. Each item except the first has a unique predecessor, and each item except the last has a unique successor. 1, D2’s predecessor is D1, and D2’s successor is D3. 1 A linear collection. © 2014 Cengage Learning® Everyday examples of linear collections are grocery lists, stacks of dinner plates, and a line of customers waiting at an ATM. Hierarchical Collections Data items in hierarchical collections are ordered in a structure resembling an upsidedown tree.

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Fundamentals of Python: Data Structures by Kenneth Lambert

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