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POWriting a generalized function for both strings and lists in python
 

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  1. POWriting a generalized function for both strings and lists in python
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    <p>So i'm green as grass and learning programming from <a href="http://openbookproject.net/thinkcs/python/english3e/lists.html" rel="nofollow">How to think like a computer scientist: Learn python 3</a>. I'm able to answer the question (see below) but fear i'm missing the lesson. </p> <p>Write a function (called insert_at_end) that will pass (return the bold given the two arguments before) for all three:</p> <pre><code>test(insert_at_end(5, [1, 3, 4, 6]), **[1, 3, 4, 6, 5]**) test(insert_at_end('x', 'abc'), **'abcx'**) test(insert_at_end(5, (1, 3, 4, 6)), **(1, 3, 4, 6, 5)**) </code></pre> <p>The book gives this hint:"These exercises illustrate nicely that the sequence abstraction is general, (<strong>because slicing, indexing, and concatenation</strong> are so general), so it is possible to write general functions that work over all sequence types.".</p> <p>This version doesn't have solutions on-line (that i could find) but in I found someone's answers to a previous version of the text (for python 2.7) and they did it this way:</p> <pre><code>def encapsulate(val, seq): if type(seq) == type(""): return str(val) if type(seq) == type([]): return [val] return (val,) def insert_at_end(val, seq): return seq + encapsulate(val, seq) </code></pre> <p>Which seems to be solving the question by distinguishing between lists and strings... going against the hint. So how about it Is there a way to answer the question (and about 10 more similar ones) without distinguishing? i.e not using "type()" </p>
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    1. USDrew Verlee
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    1. COI don't think you will learn anything useful from trying to solve this problem.
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      1. USDavid Heffernan
 

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