§ 2.5section 10 of 18·~3 min

Control flow

Control flow decides which lines run, and how many times. Python marks blocks of code with indentation (4 spaces), not curly braces. The line that opens a block ends with a colon.

python

amount = 1299

if amount > 1000:

    print("high value")    # indented: inside the if

print("done")              # not indented: always runs

OUTPUT

high value done

The next three sections cover making decisions, repeating work, and a compact way to build lists.