Be able to use random number generation. Students will be expected to use…

The idea

Random number generation lets a program produce unpredictable values, for example to simulate a dice roll or shuffle a quiz question. In Python you import the random module and call random.randint(1, 6) to get a whole number from 1 to 6 inclusive, or random.random() for a value between 0 and 1. You must be able to use these calls inside your own programs, storing the result in a variable and using it in output or decisions. You are not required to understand how pseudo-random numbers are generated internally; you only need to use the facility correctly. Note the range is inclusive at both ends for randint.

What earns the marks

• Selects an appropriate random function call, e.g. random.randint(1, 6), to produce a value in a required range.
• Recognises that randint includes both endpoints of the stated range.
• Uses the generated value correctly, e.g. stored in a variable and used in output or a condition.
• Distinguishes using random generation from explaining how pseudo-random numbers are produced, which is not required.

Common mistakes and how to put them right

• Assuming randint(1, 6) excludes 6.

  Put it right by stating both endpoints are included.

• Forgetting to import the random module before calling its functions.

  Put it right by adding the import statement.

• Believing you must explain the pseudo-random algorithm.

  Put it right by noting only correct use is required.

Exam tips

• Check the required range and choose a function whose endpoints match it.
• Confirm the module import appears before any random call in the code.
• Trace what value the variable holds after the call before predicting output.