函数#

介绍#

函数是 Python 编程的基本组成部分，它将代码片段打包成可重用、高效的代码块，用于执行特定任务。函数可以在程序中多次调用，从而简化代码组织，并有助于避免重复代码。此外，函数也使代码更容易调试。

Important: Defining a function alone doesn’t make it run. Use cte_thread to start a function in a new thread so it begins running right away at the start of the project, instead of waiting for an event or callback.

  • def defines a function.

  • return sends the function’s output back to the main program.

用法：

def function_name(parameters):
    # Code to execute when the function is called
    return result  # Optional, used to return a value

参数

描述

function_name

你给函数起的名字。

parameters

可选。函数调用时接受输入值的变量，允许将数据传递给函数。

result

Optional. Lets the function send a result back to the caller. If a function does not include a return statement, it will return None by default.

注意： 函数必须在调用之前定义**。

定义和调用函数#

Functions with No Parameters#

如果一个函数不需要输入，你可以定义它时不带参数。

def greeting():
    brain.print("Hello!")

# Call the greeting function
greeting()

Functions with Parameters#

你还可以向函数添加参数，从而传递函数运行所需的信息。

def move_square(moves):
    for index in range(moves):
        arm.move_inc(100, 0, 0)
        arm.move_inc(0, 100, 0)
        arm.move_inc(-100, 0, 0)
        arm.move_inc(0, 100, 0)

# Call the move_square function
move_square(4)

Functions with Default Arguments#

默认参数是指当函数调用中未提供该参数的值时，该参数将采用默认值的参数。

def move_square(moves=4):
    for index in range(moves):
        arm.move_inc(100, 0, 0)
        arm.move_inc(0, 100, 0)
        arm.move_inc(-100, 0, 0)
        arm.move_inc(0, 100, 0)

# Call the move_square function
move_square()

Return Values from Functions#

Functions can send data back to the caller using the return keyword. This allows you to capture and use the output in your program.

def times_two(number):
    return number * 2

# Display the return value
print(times_two(2))

cte_thread#

cte_thread starts a function in a new thread so it begins running right away at the start of the project.

If more than one cte_thread is used, the functions will run concurrently.

Usage:
cte_thread(function)

范围

描述

function

先前定义的函数的名称。

 
def move_square():
    # Move in a square path
    while True:
        arm.move_inc(100, 0, 0)
        arm.move_inc(0, 100, 0)
        arm.move_inc(-100, 0, 0)
        arm.move_inc(0, 100, 0)

def lights():
    # Set the Signal Tower to start blinking the blue LED
    signal_tower.set_color(SignalTower.BLUE, signal_tower.BLINK)

# Start threads — Do not delete
cte_thread(move_square)
cte_thread(lights)
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