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    <p>Let's talk about mod_python vs. mod_php.</p> <p>Since the Python language is NOT specifically designed for serving web pages, mod_python must do some additional work. </p> <p>Since the PHP language IS specifically designed to serve web pages, mod_php simply starts a named PHP module.</p> <p>In the case of mod_python (different from mod_fastcgi or mod_wsgi), the designer of mod_python decided that the best way to invoke Python is to call a method of an object defined in a module. Hopefully, that method of that object will write the headers and web page content to stdout. </p> <p>In the case of mod_wsgi, the designer decided that the best way to invoke Python is to call a function (or callable object) in a module. Hopefully that function will use the supplied object to create header and return a list strings with the web page content.</p> <p>In the case of mod_php, they just invoke the module because PHP modules are designed to serve web pages. The program runs and the result of that run is a page of content; usually HTML.</p> <p>The reason mod_php works one way, mod_python works another and mod_wsgi works a third way is because they're different. Written by different people with different definitions of the way to produce a web page. </p> <p>The php page can be object-oriented. A mod_wsgi function may be a callable object or it may be a simplef unction. Those are design choices.</p> <p>The mod_python requirement for a class is a design choice made by the designer of mod_python.</p> <p>The reason "why" is never useful. The reason "why" is because someone decided to design it that way.</p>
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    1. COFirst of all thank you you your general explanation.I think the reason " why someone decided to desgin this" is very useful also this is why i asked it.
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      1. USOguz Bilgic
    2. CONice answer but I disagree that the reason "why" is never useful. Why is useful in educating yourself.
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      1. USUser
    3. CO@User: No. Actually, it doesn't help anyone do anything. Really. It doesn't change the way @Oguz writes programs at all. It doesn't help anyone. Explaining why the sky is blue doesn't make a sunny day any better. Explaining why the snow falls doesn't make a snowy day any less cold. "Why" doesn't really help very much.
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