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simple functional programming in Language:Python

Motivation

This illustrates simple functional programming in Python. Using this style mostly reduces the code length and is more expressive although Language:Python doesnt offer full support for functional programming.

Illustration

The company model is implemented by named tuples. One can instantiate the data the same way as using classes.

Company = namedtuple('Company', ['name', 'departments'])
Employee = namedtuple('Employee', ['name', 'salary'])
Department = namedtuple('Department', ['name', 'manager', 'subunits'])

For the implementation of cut new objects have to be created because named tuples are immutable.

def cut(company):

    def cutSubunit(s):

        def cutEmployee(employee):
            return Employee(employee.name, employee.salary/2.0)

        def cutDepartment(department):
            return Department(department.name, cutEmployee(department.manager), map(cutSubunit, department.subunits))

        return cutEmployee(s) if isinstance(s, Employee) else cutDepartment(s)

    return Company(company.name, map(cutSubunit, company.departments))   

Usage

Download the source and run python operations.py

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    For you are available next options:

    will make text bold.

    will make text italic.

    will make text underlined.

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    will allow you to paste code headline into the page.

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    is list with bullets.

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    will allow your to insert slideshare presentation into the page. You need to copy link to presentation and insert it as parameter in this tag.

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