Is Python slower than Java/C#? [closed]

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Don’t conflate Language and Run-Time.

Python (the language) has many run-time implementations.

  • CPython is usually interpreted, and will be slower than native-code C#. It might be slower than Java, depending on the Java JIT compiler.

  • JYthon is interpreted in the JVM and has the same performance profile as Java.

  • IronPython relies on the same .NET libraries and IL as C#, so the performance difference will be relatively small.

  • Python can be translated to native code via PyREX, PyToC, and others. In this case, it will generally perform as well as C++. You can — to an extent — further optimize C++ and perhaps squeeze out a little bit better performance than unoptimized output from PyREX.

    For more information, see http://arcriley.blogspot.com/2009/03/so-long-pyrex.html

Note that Python (the language) is not slow. Some Python run-times (CPython, for example) will be slower than native-code C++.

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