Control#

Introduction #

Control in Python lets you tell the robot when to wait, when to repeat actions, how to make decisions, and when end the project.

Below is a list of available controls, including methods and core Python keywords:

wait – Pauses the project for a given time.
for – Repeats code for each item in a sequence.
if – Runs code if a condition is true.
if/else – Runs different code depending on a condition.
if/elif/else – Checks multiple conditions in order.
while – Repeats code while a condition is true.
break – Exits a loop immediately.
stop_program – Ends the running program.
pass – Placeholder used when no action is needed.

wait #

wait pauses for a specific amount of time before moving to the next line of code.

Usage:
wait(time, units)

Parameters	Description
`time`	The amount of time to wait, as a positive whole number or decimal.
`units`	The unit that represents the wait time: `MSEC` (default) – milliseconds, or `SECONDS`

# Build Used: Super Code Base 2.0
def main():
    # Turn right for one second
    drivetrain.turn(RIGHT)
    wait(1, SECONDS)
    drivetrain.stop()

# Start threads — Do not delete
start_thread(main)

for #

for repeats a set of actions a specific number of times. for can be used to loop through items in lists, tuples, dictionaries, sets, strings, or for a specified amount of loops with range.

Usage:

for value in expression_list:
    pass

Components	Description
`value`	A temporary variable that stores the current element in the iteration.
`expression_list`	The collection of elements being looped through (e.g., list, string, range).

# Build Used: Super Code Base 2.0
def main():
    # Move in a square path
    for index in range(4):
        drivetrain.drive_for(FORWARD, 100, MM)
        drivetrain.turn_for(RIGHT, 90)

# Start threads — Do not delete
start_thread(main)

if #

if runs the indented block of code if the condition is True.

Usage:

if condition:
    pass

Components	Description
`condition`	An expression or variable that is checked when the statement runs. If it is `True`, the code inside the `if` block executes; if it is `False`, the block is skipped.

# Build Used: Super Code Base 2.0
def main():
    # Turn when the bumper is pressed
    while True:
        if bumper.is_pressed():
            drivetrain.turn_for(RIGHT, 90)
        wait(0.1, SECONDS)

# Start threads — Do not delete
start_thread(main)

if/else #

if and else determine which indented block of code runs based on whether the condition is True or False.

Usage:

if condition:
    pass
else:
    pass

Components	Description
`condition`	An expression or variable that is checked when the statement runs. If it is `True`, the code inside the `if` block executes; if it is `False`, the code inside the `else` block executes instead.

# Build Used: Super Code Base 2.0
def main():
    # Turn when the bumper is pressed
    while True:
        if bumper.is_pressed():
            drivetrain.turn(RIGHT)
        else:
            drivetrain.stop()
        wait(0.1, SECONDS)

# Start threads — Do not delete
start_thread(main)

if/elif/else #

The if/elif/else structure selects which indented block of code runs based on conditions:

if runs its block if the condition is True.
elif checks additional conditions only if all previous conditions are False. Multiple elif statements can be used.
else runs its block only if none of the previous conditions are True.

Usage:

if condition:
    pass
elif condition:
    pass
else:
    pass

Components	Description
`condition`	An expression or variable that is checked when the statement runs. The first condition that is `True` determines which block executes; if none are `True`, the `else` block runs.

# Build Used: Super Code Base 2.0
def main():
    # Change the LED while turning
    drivetrain.turn(RIGHT)
    while True:
        if drivetrain.get_heading() < 120:
            bumper.set_color(OFF)
        elif drivetrain.get_heading() < 240:
            bumper.set_color(RED)
        else:
            bumper.set_color(GREEN)
        wait(0.2, SECONDS)

# Start threads — Do not delete
start_thread(main)

while repeatedly runs code as long as the condition is True. It can also be used like a “forever” by using True as the condition, or a “wait until” by adding not to the condition, as shown in the examples below.

Usage:

while condition:
    pass

Components	Description
`condition`	An expression or variable that is checked before each iteration. If it is `True`, the loop continues; if it is `False`, the loop stops.

# Build Used: Super Code Base 2.0
def main():
    # Turn when the bumper is pressed
    while True:
        if bumper.is_pressed():
            drivetrain.turn(RIGHT)
        else:
            drivetrain.stop()
        wait(0.1, SECONDS)

# Start threads — Do not delete
start_thread(main)

# Build Used: Super Code Base 2.0
def main():
    # Turn the other direction when the bumper is pressed
    drivetrain.turn(LEFT)
    while not bumper.is_pressed():
        wait(0.2, SECONDS)
    drivetrain.turn(RIGHT)

# Start threads — Do not delete
start_thread(main)

break #

break exits a loop immediately. break can be used to leave loops that otherwise would loop forever.

Usage:

break

Parameters	Description
	This keyword has no parameters.

# Build Used: Super Code Base 2.0
def main():
    # Stop turning after pressing the bumper
    while True:
        drivetrain.turn(RIGHT)
        if bumper.is_pressed():
            break
        wait(0.2, SECONDS)
    drivetrain.stop()
    bumper.set_color(RED)

# Start threads — Do not delete
start_thread(main)

stop_program #

stop_program ends a running project.

Usage:
stop_program()

Parameters	Description
	This method has no parameters.

# Build Used: Super Code Base 2.0
def main():
    # Stop the project after pressing the bumper
    while True:
        drivetrain.turn(RIGHT)
        if bumper.is_pressed():
            break
        wait(0.2, SECONDS)
    stop_program()

# Start threads — Do not delete
start_thread(main)

pass #

pass is a placeholder for future code and can be used to avoid errors in empty loops, conditionals, and functions.

Usage:

pass

Parameters	Description
	This keyword has no parameters.

if condition:
    pass

def function():
    pass