即使参数未得到满足，if语句仍然存在

Question

因此，我建议他们作为初学者使用these projects。我坚持第三个项目，我也试图完成子任务：

def PythagTripCheck():
    sidesCount=0
    smallSideDone=False
    mediumSideDone=False
    largeSideDone=False
    while sidesCount<3:
        whatSide=input("What side would you like to enter first? 'Small', 'Medium' or 'Large'?")
        if whatSide=="Small" or "small" or "S" or "s" and smallSideDone==False:
            smallSide=input("Enter the length of the small side:")
            if smallSide.isdigit() == False:
                print("The small side contains a character which is not a number, your numbers have been reset, try again")
                PythagTripCheck()
            else:
                sidesCount=sidesCount+1
                smallSideDone=True
        elif whatSide=="Medium" or "medium" or "M" or "m" and mediumSideDone==False:
            mediumSide=input("Enter the length of the medium side:")
            if mediumSide.isdigit() == False:
                print("The medium side contains a character which is not a number, your numbers have been reset, try again")
                PythagTripCheck()
            else:
                sidesCount=sidesCount+1
                mediumSideDone=True
        elif whatSide=="Large" or "large" or "L" or "l"and largeSideDone==False:
            largeSide=input("Enter the length of the large side")
            if largeSide.isdigit() == False:
                print("The large side contains a character which is not a number, your numbers have been reset, try again")
                PythagTripCheck()
            else:
                sidesCount=sidesCount+1
                largeSideDone=True
        else:
            print("Please try again")



PythagTripCheck()

无论如何，代码都会运行小方。 whatSide会从初始值更改为不同的值，并且当尝试第二次（不同）尝试时，当对应的一方执行时，[side] SideDone会更改为True。但是，

if whatSide=="Small" or "small" or "S" or "s" and smallSideDone==False:
        smallSide=input("Enter the length of the small side:")
        if smallSide.isdigit() == False:
            print("The small side contains a character which is not a number, your numbers have been reset, try again")
            PythagTripCheck()
        else:
            sidesCount=sidesCount+1
            smallSideDone=True

总是经历，我不明白为什么。我试过http://www.pythontutor.com/，它甚至说whatSide的值不等于小方的任何参数。

我做错了什么？