Converting from Strings to Bytes in Python 3: Which Method is More Pythonic?

When dealing with binary data, it becomes necessary to convert strings into bytes for efficient manipulation. Python 3 provides two primary methods for this task:

b = bytes(mystring, 'utf-8')
b = mystring.encode('utf-8')

Choice of Method:

According to the Python documentation, bytes() constructor accepts various source types, including strings. However, the encode() method is specifically designed for string encoding. Therefore, mystring.encode('utf-8') is more self-documenting and explicit.

Pythonic Considerations:

Python's philosophy emphasizes clarity and consistency. The inverse of encode() is decode(), which performs the reverse operation (converting bytes to strings). This symmetry enhances readability and ensures a consistent syntax for both conversions.

Performance Differences:

Benchmarks have shown that encode() marginally outperforms bytes() constructor for string encoding. However, the difference is negligible and unlikely to impact real-world performance.

Conclusion:

Based on readability, consistency, and performance considerations, mystring.encode('utf-8') is generally considered more Pythonic for converting strings to bytes. It provides clear semantics and aligns with the inverse operation of decode(), making it easier to understand and maintain Python code.