Module 14: Modules and imports

Import existing code, do math with the math module, and generate repeatable pseudorandom values with random.

Exam	PCEP-30-03
Section	5. File Handling and Module Imports (14% of the exam)
Objectives	5.2.1, 5.2.2, and 5.2.3
Exam questions	About 3, one per objective

By the end of this module you can do everything below. The objectives and their wording come from the official PCEP-30-03 syllabus.

5.2.1 Import and use modules

• Explain the purpose and benefits of importing existing code.
• Use the import keyword to load a module.
• Access objects provided by an imported module.

5.2.2 Perform mathematical evaluations using the math module

• Import and use the math module.
• Round values upward using ceil().
• Round values downward using floor().
• Remove the fractional part of a value using trunc().
• Calculate square roots using sqrt().

5.2.3 Generate and select pseudorandom values using the random module

• Import and use the random module.
• Generate pseudorandom floating-point values using random().
• Initialize the pseudorandom number generator using seed().
• Explain how setting a seed can produce repeatable results.
• Select a random element from a sequence using choice().
• Select multiple unique elements using sample().