控制#

介绍#

Python 中的控制功能可以让你告诉机器人何时等待、何时重复操作、如何做出决定以及何时结束项目。

以下是可用控件列表，包括方法和核心 Python 关键字：

  • 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.

  • program_stop – Ends the running program.

  • pass – Placeholder used when no action is needed.

等待#

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

Usage:
wait(time, units)

参数

描述

time

等待时间，以正整数或小数表示。

units

The unit that represents the wait time: MSEC (default) – milliseconds, or SECONDS

 
# Turn right for one second
drivetrain.turn(RIGHT)
wait(1, SECONDS)
drivetrain.stop()

为了#

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.

使用次数：

for value in expression_list:
    pass

成分

描述

value

一个临时变量，用于存储迭代中的当前元素。

expression_list

循环遍历的元素集合（例如，列表、字符串、范围）。

 
# Move in a square path
for index in range(4):
    drivetrain.drive_for(FORWARD, 100, MM)
    drivetrain.turn_for(RIGHT, 90)

如果#

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

用法：

if condition:
    pass

成分

描述

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.

 
# Turn after the Bumper Switch is pressed
while True:
    if bumper_a.pressing():
        drivetrain.turn_for(RIGHT, 90)
    wait(0.1, SECONDS)

如果/否则#

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

用法：

if condition:
    pass
else:
    pass

成分

描述

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.

 
# Turn when the Bumper Switch is pressed
while True:
    if bumper_switch.pressing():
        drivetrain.turn(RIGHT)
    else:
        drivetrain.stop()
    wait(0.1, SECONDS)

如果/否则#

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.

用法：

if condition:
    pass
elif condition:
    pass
else:
    pass

成分

描述

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.

 
# Change the Optical Sensor light while turning
drivetrain.turn(RIGHT)
while True:
    if drivetrain.heading() < 120:
        optical_sensor.set_light(LEDStateType.OFF)
    elif drivetrain.heading() < 240:
        optical_sensor.set_light_power(50, PERCENT)
    else:
        optical_sensor.set_light_power(100, PERCENT)
    wait(0.2, SECONDS)

尽管#

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.

用法：

while condition:
    pass

成分

描述

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.

 
# Turn when the Bumper Switch is pressed
while True:
    if bumper_switch.pressing():
        drivetrain.turn(RIGHT)
    else:
        drivetrain.stop()
    wait(0.1, SECONDS)


# Turn the other direction when the left button is pressed
drivetrain.turn(LEFT)
while not brain.buttonLeft.pressing():
    wait(0.2, SECONDS)
drivetrain.turn(RIGHT)

休息#

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

# Stop turning after pressing the left button
while True:
    drivetrain.turn(RIGHT)
    if brain.buttonLeft.pressing():
        break
    wait(0.2, SECONDS)
drivetrain.stop()

程序停止#

brain.program_stop ends a running project.

Usage:
brain.program_stop()

参数

描述

此方法没有参数。

 
# Stop the project after pressing the left button
while True:
    drivetrain.turn(RIGHT)
    if brain.buttonLeft.pressing():
        break
    wait(0.2, SECONDS)
brain.program_stop()

经过#

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

if condition:
    pass


def function():
    pass
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