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Oct 23: Sets, Input Validation

Meet in EnGeo 2208

Learning Objectives

After today's class, you should be able to:

  • Create a set, and test membership using the in operator.
  • Use a set to remove duplicates or track what you have seen.
  • Write a loop that repeats until the user enters a valid value.

Lesson Outline

Presentation [10 min]

  • Python sets: adding/removing items, set methods

Activity [20 min]

va_schools = {"JMU", "GMU", "VCU", "VT", "ODU", "WM", "UVA"}
two_letter = {"MU", "VT", "ND", "WM", "BC"}

type(va_schools)
len(two_letter)
"ND" in va_schools
"JMU" not in two_letter
len(va_schools.union(two_letter))
va_schools.intersection(two_letter)
two_letter.difference(va_schools)

Example [20 min]

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