七年級(jí)上冊(cè)走進(jìn)Python的世界turtle繪制常見(jiàn)幾何圖形

問(wèn)題場(chǎng)景01PART

ONE問(wèn)題導(dǎo)入問(wèn)題場(chǎng)景01PART

ONE問(wèn)題導(dǎo)入三層原材料合并縫合鼻梁夾層疊打褶裁斷熱壓固定掛耳繩消毒滅菌口罩生產(chǎn)流程圖問(wèn)題一：你作為口罩廠家技術(shù)人員，川附新城每位學(xué)生（1134人）在運(yùn)動(dòng)會(huì)期間需要一個(gè)口罩，如何根據(jù)口罩生產(chǎn)流程進(jìn)行批量生產(chǎn)？用自己的語(yǔ)言描述出來(lái)。將下列語(yǔ)句重復(fù)循環(huán)1134次：三層原材料合并縫合鼻梁夾層疊打褶裁斷熱壓固定掛耳繩消毒滅菌For循環(huán)02PART

TWOFor循環(huán)For<變量>

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<一組數(shù)據(jù)>:將被循環(huán)執(zhí)行的內(nèi)容縮進(jìn)冒號(hào)變量可任意命名關(guān)鍵字：讓變量逐個(gè)取代一組數(shù)據(jù)中的每個(gè)數(shù)據(jù)，每取代一次，縮進(jìn)的代碼被執(zhí)行一次range()函數(shù)：range（4）表示循環(huán)四次Foriinrange(1134):

三層原材料合并縫合鼻梁夾層疊打褶裁斷熱壓固定掛耳繩消毒滅菌圖For循環(huán)語(yǔ)句格式問(wèn)題二：將生產(chǎn)1134個(gè)口罩，用for循環(huán)表示出來(lái)For循環(huán)03PART

THREE問(wèn)題解決海龜所轉(zhuǎn)的角度：90For循環(huán)02PART

TWOFor循環(huán)fromturtleimport*screensize(300,400,”red”)pensize(4)pendown()forward(150)left(90)forward(150)left(90)forward(150)left(90)forward(150)left(90)#引入turtle模塊#保持畫布默認(rèn)值,未設(shè)置其屬性#設(shè)置畫筆粗細(xì)為4#落筆開始繪圖#往默認(rèn)正前方(右)前進(jìn)150個(gè)像素#向左轉(zhuǎn)角度#以下,重復(fù)上面兩個(gè)步驟任務(wù)一：將利用Python繪制正方形，用for循環(huán)表示出來(lái)fromturtleimport*screensize(300,400,”red”)pensize(4)pendown()Foriinrange(4):forward(150)left(90)fromturtleimport*screensize(300,400,”red”)pensize(4)pendown()forward(150)left(90)forward(150)left(90)forward(150)left(90)forward(150)left(90)fromturtleimport*screensize(300,400,”red”)pensize(4)pendown()Foriinrange(4):forward(150)left(90)正方形代碼代碼更短更簡(jiǎn)潔，易于閱讀和理解For循環(huán)02PART

TWOFor循環(huán)fromturtleimport*screensize(300,400,”red”)pensize(4)pendown()Foriinrange(3):forward(150)left()任務(wù)二：利用for循環(huán)畫出等邊三角形120海龜所轉(zhuǎn)的角度：120角度問(wèn)題PARTTHREE角度問(wèn)題任務(wù)三：利用for循環(huán)畫出六邊形和九邊形fromturtleimport*pensize(4)pencolor('red')foriinrange(6):

forward(70)left()60角度問(wèn)題PARTTHREE角度問(wèn)題任務(wù)三：利用for循環(huán)畫出六邊形和九邊形fromturtleimport*pensize(4)pencolor('red’)foriinrange(9):forward(70)left(

)40角度問(wèn)題03PART

THREE角度問(wèn)題問(wèn)題三：小組討論找出繪制正多邊形，循環(huán)的次數(shù)和旋轉(zhuǎn)角度之間的關(guān)系Foriinrange(3):forward(150)left(120°)Foriinrange(4):forward(150)left(90°)Foriinrange(6):forward(150)left(60°)Foriinrange(9):forward(150)left(40°)Foriinrange(3):forward(150)left(120°)Foriinrange(4):forward(150)left(90°)Foriinrange(6):forward(150)left(60°)Foriinrange(9):forward(150)left(40°)結(jié)論：旋轉(zhuǎn)的角度=360/n（邊數(shù)）90°40°60°120°4*90°=360°9*40°=360°6*60°=360°3*120°=360°拓展學(xué)習(xí)04PART

FOUR拓展學(xué)習(xí)拓展練習(xí)：嘗試使用for循環(huán)繪制圓形fromturtleim