Teaching efficient programming if-elif

Teaching students the differences between lots of sequential if statements versus if-elif can be challenging. One technique I tried was:

1. Select eight students and write one of their names on a piece of paper e.g. Eliza
2. Line the 8 students up and ask each in turn if there name is “Eliza” i.e. if name = “Eliza” say “Yes”. Regardless of when “Yes” is said you ask every single student in the line.
3. Line them up again and follow the same process…. as soon as a student says “Yes” don’t bother asking anyone else.

When “Eliza” is the first or second student this becomes a very clear example of differences between efficient and inefficient code. (Notwithstanding what a compiler might do of course.)

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