If statement 这个if语句非常奇怪，它只执行if语句，即使给定了elif的参数

好了，伙计们，我写了这个脚本，逻辑看起来也不错，语法也不错，但是当我尝试执行这个脚本时，它只执行if，而不是else或elif？？？我很困惑，请帮帮我？？？请试试看我的意思

import math

def main():

    usr = input('''Please select which task you would like to do?:
    plese TYPE either "Sphere Area" or "Sphere Volume"''')

    if (usr == "Sphere Area" or "sphere area"):
        sphereArea()   
    elif (usr == "Sphere Volume" or "sphere volume"):
        sphereVolume()           
    else:
        print("Please try again wrong choices:")
        return main()

def sphereArea():

    r = eval(input("Please input the radius: "))
    sa = float(4 * 3.14 *(r)**3)
    print(sa)

def sphereVolume():

    a,b,c = eval(input("Please input the Values for A,B,C in the order, please include comas::"))
    sv = float(4/3 * 3.14 * a*b*c)
    print("The Volume of the sphere is :",sv,"m3")


main()     

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如果总是计算为true，因为：您有

usr==“球体区域”或“球体区域”

在这种情况下，

“球体区域”

将始终为真

您应该写：

usr==“球体区域”或usr==“球体区域”