#Beginner - Function, Code Blocks and White Loops

Goal: 這節課完成後將學會如何使用While Loop 完成老鼠走迷宮的程式

Function in Python

Python Functions - AskPython

Built-in Functions in Python

Built-in Functions - Python 3.10.1 documentation

How Function Works?

Defining Functions

def my_function()

#Do this

#Then do this

#Finally do this

Calling Functions

my_function()

Reeborg's World

#挑戰遊戲一
def turn_right():    
   turn_left()
   turn_left()
   turn_left()

turn_left()
move()
turn_right()
move()
turn_right()
move()
turn_right()
move()

Reeborg's World

#挑戰遊戲二
def turn_right():    
   turn_left()
   turn_left()
   turn_left()

for i in range(1,7):
    move()
    turn_left()
    move()
    turn_right()
    move()
    turn_right()
    move()
    turn_left()

#挑戰遊戲二
def turn_right():    
   turn_left()
   turn_left()
   turn_left()

def jump():
    move()
    turn_left()
    move()
    turn_right()
    move()
    turn_right()
    move()
    turn_left()

#While Loop與邏輯判斷
while at_goal() != True: 

# 也可以寫成這樣 while not at_goal():

Identation

def my_function():
#以下為函數的程式碼區塊必須向右移動4個空格縮排,以此類推, 為程式碼區塊 
****#Do this
	  #Then do this
	  Finally do this

Difference between For and While Loop

• For
• While

Hurdles Challenge using While Loops

https://reeborg.ca/reeborg.html?lang=en&mode=python&menu=worlds%2Fmenus%2Freeborg_intro_en.json&name=Hurdle 3&url=worlds%2Ftutorial_en%2Fhurdle3.json

#挑戰遊戲三 
def turn_right():    
   turn_left()
   turn_left()
   turn_left()

def jump():   
    #關鍵: 1. 要越過障礙牆的動作, 左,進,右,進,右,進,左
		turn_left()
    go_move()
    turn_right()
    go_move()
    turn_right()
    go_move()
    turn_left()  

def go_move():
		#關鍵: 2. 要能自動判斷前方是否有牆
    if front_is_clear():
        move()

while at_goal() != True:
    if wall_in_front():
				jump()        
    else:
        go_move()

Reeborg's World

#挑戰遊戲四
def turn_right():
    turn_left()
    turn_left()
    turn_left()

def jump():
    turn_left()
    #越過障礙牆的的步驟, 自動判斷右邊有沒有牆, 有牆, 則繼續往前走
    while wall_on_right():
        move()
    turn_right()
    move()
    turn_right()
    #越過障礙牆要落地的步驟
    while front_is_clear():
        move()
    #遇到前方有障礙, 要左轉
    turn_left()
        
while not at_goal():
    if wall_in_front():
        jump()    
    else:
        move()

Reeborg's World

#挑戰遊戲五
def turn_right():    
   turn_left()
   turn_left()
   turn_left()

def go_move():
    if front_is_clear():
        move()
        
while at_goal() != True:
    #假設機器人一開始都是靠右邊走
    if right_is_clear():
        turn_right()
        move()
    #右邊有牆,就往前
    elif front_is_clear():
        move()
    #若都不是, 就往左
    else:
        turn_left()

Note: 這裡還有老師的三個很難的作業