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    <p>Python being a fully dynamic language is always going to have the advantage here over more static languages like C# and Java. Java and C# have also traditionally targeted more conservative markets, making them more conservative by design. Although C# gains more and more dynamic oriented features with each new release. </p> <pre><code>Dynamic object attributes definition (using __getattr__, etc.) </code></pre> <p>This can be accomplished in C# 4.0 using the new dynamic support. With <code>IDynamicObject</code> it's possible to implement "method_missing" (ala Ruby) in C#. However doing this is really against the language's overall intent and "feel", and I've never seen it done in practice (with the possible exception of ASP.NET MVC's ViewBag)</p> <pre><code>Operator overloading </code></pre> <p>C# has operator overloading. However in my experience it is almost never used.</p> <pre><code>Subclassing of built in types </code></pre> <p>Only if the type is not sealed. If it is sealed, extension methods often do the trick. Many/most built in types in C# are sealed. </p> <pre><code> Mappings and sequence simulation using __getitem__, __setitem__, and __delitem__, etc., "magic" methods </code></pre> <p>Implementing <code>IEnumerable&lt;T&gt;</code> is probably your best bet in C#. This will let your type hook into LINQ and get all kinds of goodies for "free"</p> <p>I have very little experience with Python, my "dynamic language of choice" has been Ruby. I've also professionally worked in C# since it debuted. C# has really come a long ways and has grown into a pretty decent language. It does have a "kitchen sink" feel to it, which can be intimidating at first. But for the most part it does come together well. However, the fluidity, flexibility, power and potential for abuse that Ruby has is not present in C#. A hardcore ruby-ist (and presumably, python-ist) will almost certainly find C# frustrating and limiting. C# is still very much an "enterprise" language, and always will be.</p>
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    1. POAre Java and C# as "customizable" as Python?
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    1. USMatt Greer
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    1. COOperator overloading is used a lot in C# but it's typically considered more of a commodity than a necessity. I recall seeing some graphics/math engine code using it extensively for vector and matrix operations.
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      1. USAnthony Vallée-Dubois
    2. COmath related operations are one case where operator overloading can make sense. IMO though operator overloading is almost always a bad idea.
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