8INPUT VALIDATION
Input validation code checks that values entered by the user, such as text from the input() function, are formatted correctly. For example, if you want users to enter their ages, your code shouldn’t accept nonsensical answers such as negative numbers (which are outside the range of acceptable integers) or words (which are the wrong data type). Input validation can also prevent bugs or security vulnerabilities. If you implement a withdrawFromAccount() function that takes an argument for the amount to subtract from an account, you need to ensure the amount is a positive number. If the withdrawFromAccount() function subtracts a ...
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