def startgreen():
# Remember all code in the function is indented
# Turn the green off and the amber on for 3 seconds
# ('Pedestrian' red LED stays lit)
def steadyamber():
# Remember all code in the function is indented
# Turn the amber off, and then the red on for 1 second
def steadyred():
# Remember all code in the function is indented
# Sound the buzzer for 4 seconds
# (If you have the 'pedestrian' LEDs, turn the red off and green on)
def startwalking():
# Make the buzzer buzz on and off, half a second of
# sound followed by half a second of silence
# Turn the buzzer off and wait for 2 seconds
# (If you have a second green 'pedestrian' LED, make it flash on and
# off for the two seconds)
def dontwalk():
# Remember all code in the function is indented
# Flash the amber on and off for 6 seconds
# (And the green 'pedestrian' LED too)
def flashingambergreen():
# Remember all code in the function is indented
# Flash the amber for one more second
# (Turn the green 'pedestrian' LED off and the red on)
def flashingamber():
# Remember all code in the function is indented
# Go through the traffic light sequence by calling each function
# one after the other.
def trafficlightqequence():
# Remember all code in the function is indented
os.system('clear') # Clears the terminal
print("Traffic Lights")
# Initialise the traffic lights
startgreen()
# Here is the loop that waits at lease 20 seconds before
# stopping the cars if the button has been pressed
while True: # Loop around forever
buttonnotpressed = True # Button has not been pressed
start = time.time() # Records the current time
while buttonnotpressed: # While the button has not been pressed
time.sleep(0.1) # Wait for 0.1s
if button.ispressed: # If the button is pressed
now = time.time()
buttonnotpressed = False # Button has been pressed
if (now - start) <= 20: # If under 20 seconds
time.sleep(20 - (now - start)) # Wait until 20s is up
trafficlightqequence() # Run the traffic light sequence
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