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This technical article provides an in-depth exploration of string encoding concepts in Python, with particular focus on the differences between Python 2 and Python 3 in handling Unicode and UTF-8 encoding. Through detailed code examples and theoretical explanations, it systematically introduces multiple methods for string encoding conversion, including the encode() method, bytes constructor usage, and error handling mechanisms. The article also covers fundamental principles of character encoding, Python's Unicode support mechanisms, and best practices for handling multilingual text in real-world development scenarios.