我正在學(xué)習(xí) python 中的基本 for 循環(huán)，并注意到變量“x”與變量“sides”相比可以正常工作。怎么來的？我用谷歌搜索了循環(huán)，并了解了 range 和 xrange 之間的區(qū)別，但似乎與我的問題無關(guān)。以下顯示了第一段有錯(cuò)誤的代碼：ZeroDivisionError：在線整數(shù)除法或模數(shù)為零...# This code leads to the ZeroDivisionErrorimport turtlewn = turtle.Screen()mikey = turtle.Turtle()sides = int(input("How many sides would you like your regular  polygon to have?"))length = int(input("How long would you like the sides to be?"))color = ("What color would you like to fill the polygon?")for sides in range(sides):    mikey.down()    mikey.forward(length)    mikey.left(360/sides)# this code works fineimport turtlewn = turtle.Screen()mikey = turtle.Turtle()sides = int(input("How many sides would you like your regular  polygon to have?"))length = int(input("How long would you like the sides to be?"))color = ("What color would you like to fill the polygon?")x = sidesfor sides in range(sides):    mikey.down()    mikey.forward(length)    mikey.left(360/x)為什么后者可以正常工作，而前者卻不行？