The Python Apprentice by Robert Smallshire and Austin Bingham

Author:Robert Smallshire and Austin Bingham [Robert Smallshire and Austin Bingham]
Language: eng
Format: epub, pdf
Publisher: leanpub.com
Published: 2016-01-21T00:00:00+00:00

Naturally, the consequence of the log() failure is the raising of another exception, also a ValueError.

Much better, and altogether more Pythonic, to forget about error return codes completely and revert to raising an exception from convert().

Re-raising exceptions

Instead of returning an unPythonic error code, we can emit our error message and re-raise the exception object we’re currently handling. This can be done by replacing the return -1 with a raise statement at the end of our exception handling block:

def convert(s): """Convert a string to an integer.""" try: return int(s) except (ValueError, TypeError) as e: print("Conversion error: {}".format(str(e)), file=sys.stderr) raise

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