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

2.2.1 Create condition-controlled loops using while

  • Use a while loop to repeat instructions while a condition remains true.
  • Initialize and update loop-control variables (sentinel values).
  • Trace the execution of a condition-controlled loop.
  • Recognize conditions that may result in an infinite loop.
  • Use assignment expressions with the walrus operator := where appropriate.

2.2.2 Iterate through sequences and iterable objects using for and in

  • Use a for loop to iterate through a sequence or iterable object.
  • Use the in operator to retrieve successive elements from an iterable.
  • Iterate through common iterable objects such as strings, lists, and tuples.
  • Process each element of an iterable within a loop.
  • Trace the values assigned to the loop variable during execution.

2.2.3 Generate numeric iterations using range()

  • Use range() to generate integer sequences for loop iteration.
  • Use the start, stop, and step arguments of range().
  • Use positive and negative step values.
  • Trace the values produced by range() during loop execution.

2.2.4 Construct nested loops and combined control structures

  • Nest one loop inside another loop.
  • Combine loops with conditional statements.
  • Trace the execution order of nested loops.
  • Use nested loops to process multidimensional or grouped data.

2.2.5 Control loop execution using break, continue, and pass

  • Use break to terminate a loop before its normal completion.
  • Use continue to skip the remainder of the current iteration.
  • Use pass as a syntactic placeholder for an empty block.
  • Trace loops that contain break, continue, or pass.