Adafruit Feather M4 Express Manual page 43

It will look like this - note that under the
while True:
line, the next four lines have spaces to indent them, but
they're indented exactly the same amount. All other
lines have no spaces before the text.
Save this file as code.py on your CIRCUITPY drive.
On each board you'll find a tiny red LED. It should now be blinking. Once per second
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