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Python Key Skills - Data Validation

Data Validation

Learn It

Data Validation means to check data used or entered in a program are valid.
valid can mean different things depending on the context of the program. For example, it could be that your program only accepts alphabetical letters or numbers, or a number that is only within a certain range or a legitimate email address.

Code It - example 1: only accepts numbers as input

The easiest way of doing this is to use the Python built-in function isnumeric

Code It - example 2: only accepts numbers within expected range

To accomplish this, we need to use if statements and additional flag (True or False Boolean value)

Code It - example 3: only accepts alphabetical letters

To accomplish this, we need to use another built-in function isalpha

Try It

Can you work out how to validate an input that is alphabetical letters and it can only be not more than 12 characters long?