range()

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range(5) gives 0-4; range(1, 4) gives 1-3.

What does range(3) produce?

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What you start with

total = 0
for i in range(4):
    total += i
print(total)

Python 1 automatic check Control flow and functions

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total = 0
for i in range(4):
    total += i
print(total)

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