Validating data input in a program
Lesson details
Learning outcome
I can explain the purpose of validation checks and use iteration to ensure data entered is reasonable.
Key learning points
- Validation checks are used to ensure that data that is entered is reasonable and expected.
- Iteration is used to ensure the validation checks are implemented correctly.
Keywords
Validation - checking that data is acceptable by comparing it against a set of criteria
Crash - when a program suddenly stops working and closes unexpectedly, often due to an error it cannot recover from
Common misconception
A program will automatically ask people to try again if data is invalid.
The program will only ask for data to be input again if it has been programmed to do so; otherwise it will run with invalid data and may crash.
Teacher tip
Demonstrate what happens when validation is missing. Show how a program crashes or accepts invalid data. Live code an example using a while loop to validate input, highlighting how iteration ensures only reasonable data is accepted.
Equipment
Pupils will need access to a device that can edit and run Python programs. Examples in this lesson use the RPF Code Editor https://oak.link/python-editor
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is a module in programming?
Q2.What is the Python standard library?
Q3.Which module is used to generate unpredictable numbers in Python?
Q4.What type of loop is typically used for repeating until data is valid?
Q5.Which function is used to convert user input to an integer?
Q6.What command is used to bring a module into your Python program?
Assessment exit quiz
6 Questions
Q1.Match the keywords to their definitions:
checking data is acceptable by comparing it against a set of criteria
when a program stops functioning and exits unexpectedly
repeating tasks until a condition is met
Q2.Which of the following is an example of validation?
Q3.What happens if a program does not explicitly include instructions to handle invalid data?
Q4.Arrange the steps to validate user input:
Q5.What type of loop is commonly used for validation?
Q6.What is the purpose of a validation error message?
To help you plan your 10 computer science lesson on: Validating data input in a program, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 10 computer science lesson on: Validating data input in a program, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 computer science lessons from the Programming: iteration unit, dive into the full secondary computer science curriculum, or learn more about lesson planning.