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Control Flow

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Reading compass

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Control flow decides which lines run and how many times they run.

Branches

An if statement asks a yes/no question. Only the matching branch runs.


python
score = 7
if score >= 8:
    badge = "gold"
else:
    badge = "steady"

The condition is false, so badge becomes "steady".

A loop repeats a block. The safest reading habit is to track the loop variable and the state that changes.


python
total = 0
for n in [2, 4, 6]:
    total = total + n

The values of total are 2, 6, then 12.

For every loop, name: