Python: The Ultimate Beginners Guide: Start Coding Today by Eric Smith

Author:Eric Smith
Language: eng
Format: azw3, epub, pdf
Publisher: http://wizeduck.com/
Published: 2016-05-30T07:00:00+00:00

Try the program right now: it was much more convenient to use. To stop the sum and get the full, just press [Enter] on a blank line. A good improvement in "usability" of the adder!

How to treat a real error

The third issue of the adder is not there yet: treat in the same way the situation in which user did not type anything and the one where he typed something that is not a valid number in Python. It may be that the user is an old typist, you type lowercase L in place of the digit 1. Or someone who wants to use, with good reason, the "," as decimal separator (Python only accepts numbers with a decimal point). To distinguish one type from another error, and know when you just want to close the program, we need to save the line he typed before trying to turn it into a number. Here's how the list below:

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