4.1.1 函數(shù)的概念和作用

函數(shù)的概念和作用函數(shù)的概念print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")defBirthday():print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")函數(shù)的概念函數(shù)是組織好的、可重復(fù)使用的、用來實(shí)現(xiàn)單一或相關(guān)聯(lián)功能的代碼段defBirthday():print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")能提高應(yīng)用的模塊性和代碼的重復(fù)利用率print()、input()等內(nèi)置函數(shù)支持用戶自定義函數(shù)函數(shù)的作用函數(shù)的使用可以解決代碼冗余print("張三同學(xué)，送你一首歌，祝你學(xué)習(xí)進(jìn)步")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("李四老師，送您一首歌，祝您工作順利！")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")defBirthday():print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("Happybirthdaytoyou!")print("張三同學(xué)，送你一首歌，祝你學(xué)習(xí)進(jìn)步")Birthday()print(“李四老師，送你一首歌，祝您工作順利！")Birthday()函數(shù)的作用函數(shù)的封裝能夠保護(hù)內(nèi)部的數(shù)據(jù)deffunc():a=1

func()print(“外部的a=“,a)deffunc():a=1print(“內(nèi)部的a=”,a)func()函數(shù)的作用函數(shù)能夠提高程序的可讀性，使得程序模塊化cala.pynew_cala.pydefadd(a,b):returna+bdefnum(a,b):returna-bimportmathprint(math.pi)print(math.pow(2,3))print('------自定義函數(shù)導(dǎo)入------')importcalaprint(cala.add(2,8))print(cala.num(10,6))函數(shù)的作用函數(shù)能夠提高程序的可維護(hù)性和可擴(kuò)展性需要修改的地方少可維護(hù)性是指當(dāng)需要修改程序的某個(gè)模塊