How Can I Efficiently Convert Bytes to Hex Strings and Back in Python 3?

Converting Bytes to Hex Strings in Python 3

When working with bytes in Python 3, converting them into hex strings can be a common task. Despite the availability of various approaches, some methods may not yield the desired results.

The Modern Solution: .hex()

Python 3.5 introduced a dedicated method, bytes.hex(), which simplifies this conversion:

>>> b'\xde\xad\xbe\xef'.hex()
'deadbeef'

This method returns a hexadecimal representation of the bytes.

Reversing the Conversion

To convert a hex string back to bytes, you can use bytes.fromhex():

>>> bytes.fromhex('deadbeef')
b'\xde\xad\xbe\xef'

This method accepts a hexadecimal string and returns a byte array. The conversion supports both the bytes and bytearray types.

Additional Considerations

Note that this method operates on binary data and not strings. If you have a string, you may need to encode it to bytes first, for example, using bytes(string, 'utf-8').

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