为什么这只是打印我的数组，而不是做数学和打印出完成的数学？

Question

我试图让它从一个数组（newSideList）中取同一个数，并将它们相乘，从而将它们平方，因为我试图使用的和是s^2*n/（4*tan（180/n））。但是，当我运行代码时，它似乎在数组中做了一些计算，我不知道是什么或为什么。请有人解释一下

上半部分的其余部分可以工作，因为我运行它时没有这个数学部分，它似乎不能正确地执行这个计算

import math import numpy as np sideList = [] numOfSides = int(input("How many sides does your shape have? ")) for i in range(0,numOfSides): lengths = str(input("Please input the length of each side individually: ")) sideList.append(lengths) processSideList = np.array([sideList]) newSideList = processSideList.astype(np.float) def areaCalcReg(): area = newSideList[0] * newSideList[0] * numOfSides / 4 * math.tan(180/numOfSides) print(area) #def areaCalcIrreg(): #def perimCalc(): decision = str(input("Is this a regular or irregular shape?\nType an R for regular or I for irregular: ")) if decision == "R" or decision == "r": areaCalcReg() #elif decision == "I" or decision == "i": #areaCalcIrreg() #else: #if decision != "R" and decision !="r" and decision != "I" and decision != "i": #print("Please pick either an R for regular or an I for irregular.\n") #return()

Answer 1

有两个问题：

1）三角函数使用弧度，即您应该使用

math.tan(math.pi/numOfSides)

2）因为缺少一对圆括号，所以要乘以切线

area = newSideList[0] * newSideList[0] * numOfSides / (4 * math.tan(math.pi/numOfSides))