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Subsequent versions of Python 3 have refined the language by embracing modern programming paradigms, expanding the standard library, enhancing performance, and adapting to user needs and global tech trends.

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The def keyword is used to create, (or define) a function in python.

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Backward compatibility is important because it allows users to run older code without modification. This is crucial for maintaining existing applications and systems, ensuring that updates do not break functionality.

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Yes, Python 3 is considered a general-purpose language because it can be used for a wide variety of applications, from web development to scientific computing, making it versatile and adaptable to different tasks.

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The order of precedence is: %, +. Hence the expression above, on simplification results in 4 + 3 = 7. Hence the result is 7.

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For order of precedence, just remember this PEMDAS (similar to BODMAS).

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Python 2.0 was released in 2000. Its main improvements included making programming smoother and more efficient, significantly expanding the language's toolkit to achieve a wider range of tasks out of the box.

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Python 3.0 aimed to correct inconsistencies and design flaws in the language, even if it meant breaking backward compatibility. It eliminated outdated practices and promoted more modern and intuitive programming methods.

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The function sys.version can help us to find the version of python that we are currently working on. It also contains information on the build number and compiler used. For example, 3.5.2, 2.7.3 etc. this function also returns the current date, time, bits etc along with the version.

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Python language is designed by a Dutch programmer Guido van Rossum in the Netherlands.