``` from math import radians,cos n = cos(radians(0)) print(n) ``` ``` #from math import radians,cos #n = cos(radians(0)) #print(n) import turtle # set to radians turtle.radians() # turn to left by 90 turtle.left(90) # move forward by 100 turtle.forward(100) ``` ``` import turtle # move as default in degrees turtle.left(90) # take value by heading print(turtle.heading()) # set to radians turtle.radians() # agian take value by heading print(turtle.heading()) ``` ``` from turtle import * from random import * from math import * def tree(n,l): pd()#下筆 #陰影效果 t = cos(radians(heading()+45))/8+0.25 pencolor(t,t,t) pensize(n/3) forward(l)#畫樹枝 if n>0: b = random()*15+10 #右分支偏轉角度 c = random()*15+10 #左分支偏轉角度 d = l*(random()*0.25+0.7) #下一個分支的長度 #右轉一定角度,畫右分支 right(b) tree(n-1,d) #左轉一定角度，畫左分支 left(b+c) tree(n-1,d) #轉回來 right(c) else: #畫葉子 right(90) n=cos(radians(heading()-45))/4+0.5 pencolor(n,n*0.8,n*0.8) circle(3) left(90) #添加0.3倍的飄落葉子 if(random()>0.7): pu() #飄落 t = heading() an = -40 +random()*40 setheading(an) dis = int(800*random()*0.5 + 400*random()*0.3 + 200*random()*0.2) forward(dis) setheading(t) #畫葉子 pd() right(90) n = cos(radians(heading()-45))/4+0.5 pencolor(n*0.5+0.5,0.4+n*0.4,0.4+n*0.4) circle(2) left(90) pu() #返回 t=heading() setheading(an) backward(dis) setheading(t) pu() backward(l)#退回 bgcolor(0.5,0.5,0.5)#背景色 ht()#隱藏turtle #showturtle() speed(0)#速度 1-10漸進，0 最快 tracer(0,0) pu()#抬筆 bk(100) left(90)#左轉90度 pu()#抬筆 bk(300)#后退300 tree(12,100)#遞歸7層 #done() ``` ``` from turtle import * #import random import * #import math import * bgcolor(0.5,0.5,0.5)#背景色 ht()#隱藏turtle #showturtle() speed(0)#速度 1-10漸進，0 最快 tracer(0,0) pu()#抬筆 bk(100) left(90)#左轉90度 pu()#抬筆 bk(300)#后退300 tree(12,100)#遞歸7層 done ```