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    <p>I've been burned for broadcasting these opinions in public before, but here goes:</p> <p><b>Well-written code in dynamically typed languages follows static-typing conventions</b></p> <p>Having used Python, PHP, Perl, and a few other dynamically typed languages, I find that well-written code in these languages follows static typing conventions, for example:</p> <ul> <li><p>Its considered bad style to re-use a variable with different types (for example, its bad style to take a list variable and assign an int, then assign the variable a bool in the same method). Well-written code in dynamically typed languages doesn't mix types.</p></li> <li><p>A type-error in a statically typed language is still a type-error in a dynamically typed language.</p></li> <li><p>Functions are generally designed to operate on a single datatype at a time, so that a function which accepts a parameter of type <code>T</code> can only sensibly be used with objects of type <code>T</code> or subclasses of <code>T</code>.</p></li> <li><p>Functions designed to operator on many different datatypes are written in a way that constrains parameters to a well-defined interface. In general terms, if two objects of types <code>A</code> and <code>B</code> perform a similar function, but aren't subclasses of one another, then they almost certainly implement the same interface.</p></li> </ul> <p>While dynamically typed languages certainly provide more than one way to crack a nut, most well-written, idiomatic code in these languages pays close attention to types just as rigorously as code written in statically typed languages.</p> <p><b>Dynamic typing does not reduce the amount of code programmers need to write</b></p> <p>When I point out how peculiar it is that so many static-typing conventions cross over into dynamic typing world, I usually add "so why use dynamically typed languages to begin with?". The immediate response is something along the lines of being able to write more terse, expressive code, because dynamic typing allows programmers to omit type annotations and explicitly defined interfaces. However, I think the most popular statically typed languages, such as C#, Java, and Delphi, are bulky by design, not as a result of their type systems.</p> <p>I like to use languages with a <em>real</em> type system like OCaml, which is not only statically typed, but its type inference and structural typing allow programmers to omit most type annotations and interface definitions.</p> <p>The existence of the ML family of languages demostrates that we can enjoy the benefits of static typing with all the brevity of writing in a dynamically typed language. I actually use OCaml's REPL for ad hoc, throwaway scripts in exactly the same way everyone else uses Perl or Python as a scripting language.</p>
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    1. POWhat's your most controversial programming opinion?
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    1. USJuliet
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      1. VTUpMod
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    1. CO100% right. If only the Python developers would finally acknowledge this and change their otherwise exceptional language accordingly. Thanks for posting this.
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      1. USKonrad Rudolph
    2. COBut there is already one statically-typed Python-like language. Tt's called C# ;-)
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      1. USzuber
    3. COC# is python-like? Maybe you meant Boo ;)
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