python-patterns/patterns/behavioral/template.py at master · botdigit/python-patterns · GitHub

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#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

An example of the Template pattern in Python

*TL;DR80

Defines the skeleton of a base algorithm, deferring definition of exact

steps to subclasses.

*Examples in Python ecosystem:

Django class based views: https://docs.djangoproject.com/en/2.1/topics/class-based-views/

"""

def get_text():

return "plain-text"

def get_pdf():

return "pdf"

def get_csv():

return "csv"

def convert_to_text(data):

print("[CONVERT]")

return "{} as text".format(data)

def saver():

print("[SAVE]")

def template_function(getter, converter=False, to_save=False):

data = getter()

print("Got `{}`".format(data))

if len(data) <= 3 and converter:

data = converter(data)

else:

print("Skip conversion")

if to_save:

saver()

print("`{}` was processed".format(data))

def main():

"""

>>> template_function(get_text, to_save=True)

Got `plain-text`

Skip conversion

[SAVE]

`plain-text` was processed

>>> template_function(get_pdf, converter=convert_to_text)

Got `pdf`

[CONVERT]

`pdf as text` was processed

>>> template_function(get_csv, to_save=True)

Got `csv`

Skip conversion

[SAVE]

`csv` was processed

"""

if __name__ == "__main__":

import doctest

doctest.testmod()

python-patterns/patterns/behavioral/template.py at master · botdigit/python-patterns · GitHub

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