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POQuestions on "Python Is Not Java"
 

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  1. POQuestions on "Python Is Not Java"
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    <p>I'm a novice programmer with basic Java experience, and currently learning Python. I've stumbled across this blog post in another question thread:</p> <p><a href="http://dirtsimple.org/2004/12/python-is-not-java.html" rel="noreferrer">http://dirtsimple.org/2004/12/python-is-not-java.html</a></p> <p>and I've got a couple of questions regarding the topic posted:</p> <hr> <blockquote> <p>1) "Oh, and all those Foo.Bar.Baz attribute chains don't come for free, ... , so each dot counts. "</p> </blockquote> <p>Is the solution to this particular problem is importing module and its method beforehand? Such as:</p> <pre><code> from Foo.Bar import Baz ... #now Baz() can be called directly without using Foo.Bar.Baz() everytime </code></pre> <hr> <blockquote> <p>2) Got a switch statement? The Python translation is a hash table, not a bunch of if-then statments.</p> </blockquote> <p>There are several related answers regarding this topic, but they also raise a couple of questions:</p> <ol> <li>Use of if-else is cleaner, but it doesn't have the advantage of constant time O(1) in switch statement.</li> <li>Use of hash for constant time O(1)</li> <li>Use of lambda function in hash for comparison (not recommended) <ul> <li>Why is it not recommended? Is it because the lambda function removes the constant factor of hash?</li> </ul></li> <li>Use of bisect module <ul> <li>Does this method retain the constant time O(1), or it is just another type of lambda function?</li> <li>So what method in Python, that is equal to switch statement, with constant time O(1), while at the same time allowing comparison statement?</li> </ul></li> </ol> <hr> <blockquote> <p>3) Getters and setters are evil. Evil, evil...don't write getters and setters ... This is what the 'property' built-in is for ... In Python, this (getter and setter) is silly, because you can start with a normal attribute and change your mind at any time, without affecting any clients of the class.</p> </blockquote> <p>I don't really quite understand this part. </p> <p>Also, it seems that in Python public and private method or variable can be easily accessed, in contrast of that in C++ and Java. Is there any design reason for this behavior?</p> <hr> <p>Finally, is there any recommended further good read on Python vs. any other programming language?</p>
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    1. USRobert Greiner
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    1. COIf you have multiple questions, please split them in multiple questions.
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    2. COYes, please split your question into multiple more-targeted questions.
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      1. POQuestions on "Python Is Not Java"
      1. USSteven Rumbalski
    3. COPlease do not try to learn any programming language by leveraging knowledge of another programming language. Programming languages (with a few exceptions) are more different than alike. It's much easier on your brain to start "from scratch" when learning a new language. Try to avoid comparing syntax or semantics between languages.
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