SavedText(list) clear solution for Text Editor by flpo - python coding challenges

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SavedText(list) solution in Clear category for Text Editor by flpo

class Text:
    text = font = ''
    
    def write(self, text):
        self.text += text

    def restore(self, old):
        self.text, self.font = old

    def set_font(self, font):
        self.font = f'[{font}]'

    def show(self):
        return f'{self.font}{self.text}{self.font}'

class SavedText(list):
    get_version = list.__getitem__

    def save_text(self, text):
        self.append((text.text, text.font))

June 27, 2018

Comments:

veky on July 2, 2018, 3:39 p.m.
You can use a few more batteries. :-)

Dr__ON on March 4, 2019, 3:33 a.m.
<blockquote> get_version = list.getitem </blockquote> Cool solution! But I can't understand how it works... And how does your code work in common?

TapojyotiMandal on April 11, 2019, 5:54 a.m.
Two doubts regarding the soluttion:- 1. What does "class SavedText(list):" do here? Does passing of "list" as an object defines that "SavedText" is of the type "list"? 1. "getversion = list.getitem" Is "getversion" here an attribute of "SavedText" or is it a method of "SavedText". It seems like a attribute, but then why can we have a call like "saver.get_version(0)" if it's an attribute and not a method?

flpo on April 12, 2019, 6:45 p.m.
<ol> <li>`class SavedText(list)` is nothing more than usual subtyping: `list` is a type, you can ask to Python and he will confirm that: <blockquote> <blockquote> <blockquote> type(list) <class 'type'> </blockquote> </blockquote> </blockquote></li> <li>Here the point is more subtle: Python is not like Java, the difference between attribute and method is more duck-typed here :-). Instead of thinking about attributes and methods, you should think about objects, then you can call an object only if it is `callable`. Again, ask Python to help you, it usually does ;-) help(callable) callable(obj, /) Return whether the object is callable (i.e., some kind of function). Note that classes are callable, as are instances of classes with a call() method.</li> </ol>

Everything is Object

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