<evaluates — title: Control | VEX GO - Python API description: Explore the Python API reference for controls with VEX GO. Find detailed descriptions for methods, parameters, and usage examples.

控制

介绍

Control includes methods for timing, program flow, conditional logic, and project termination. These controls let you pause execution, create loops, define logic paths, and end a program.

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

• wait – Pauses execution for a given number of milliseconds or seconds.

• for – Repeats code for each item in a sequence.

• if – Executes 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.

等待

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

用法：
wait(time, units)

参数	描述
time	The amount of time to wait, as a positive integer or float.
units	The unit that represents the wait time: MSEC (default) – milliseconds 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)

为了

for 遍历一个序列（例如列表、元组、字典、集合或字符串）或任何可迭代对象。它对序列中的每个项目执行一次代码块。

使用量：

for value in expression_list:
    pass

Components	描述
value	存储迭代中的当前元素的临时变量。
expression_list	循环遍历的元素集合（例如，列表、字符串、范围）。

# 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)

如果

if executes the indented block of code if the condition evaluates to True.

用法：

if condition:
    pass

Components	描述
condition	An expression or variable that is evaluated when the statement runs. If it evaluates to True, the code inside the if block executes; if it evaluates to 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)

如果/否则

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

用法：

if condition:
    pass
else:
    pass

Components	描述
condition	An expression or variable that is evaluated when the statement runs. If it evaluates to True, the code inside the if block executes; if it evaluates to 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)

如果/否则

if/elif/else 结构根据条件选择运行哪个缩进的代码块：

• if runs its block if the condition evaluates to True.

• elif 仅当所有先前条件的评估结果为 False时才检查附加条件。可以使用多个 elif 语句。

• else 仅当先前的条件都不为 True时才运行其块。

用法：

if condition:
    pass
elif condition:
    pass
else:
    pass

Components	描述
condition	An expression or variable that is evaluated when the statement runs. The first condition that evaluates to 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)

尽管

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

用法：

while condition:
    pass

Components	描述
condition	An expression or variable that is evaluated before each iteration. If it evaluates to True, the loop continues; if it evaluates to 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)

休息

break 立即退出循环。

使用量：

break

参数	描述
	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)

停止程序

stop_program ends a running project.

Usage:
stop_program()

参数	描述
	该方法没有参数。

# 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)

经过

pass 是未来代码的占位符，可用于避免空循环、条件和函数中的错误。

使用量：

pass

参数	描述
	This keyword has no parameters.

if condition:
    pass

def function():
    pass