TypeError:“float”对象不能解释为整数

Question

为什么对象被解释为int而不是float。

main2 = True

while main2:
     try:
        amount = float(input('annual gross income: '))
        namount = float(amount)
        expenses = float(input('annual expenses: '))
        nnexpenses = float(expenses)



        if(9226 <= namount <= 37450):
                print('Your tax rate is  $922.50 + 15%')
                print(float(round(namount - namount*0.15 - 922.50 - nnexpenses)))
        if(namount <= 9225):
                print('Your tax rate is 10%')
                print(float(round(namount - namount*0.10 - nnexpenses,2)))
        if(37451 <= namount <= 90750 ):
                print('Your tax rate is  $5, 156.25 + 25%')
                print(float(round(amount - namount*0.25 - 5,156.25 - nnexpenses)))
        if(90751 <= namount <= 189300):
                 print('Your tax rate is  $18,481.25 + 28%')
                 print(float(round(amount - namount*0.28 - 18,481.25 - nnexpenses))) 
        if(189301 <= namount <= 411500):
                print('Your tax rate is  $46,075.25 + 33%')
                print(float(round(namount - namount*0.33 - 46,075.25 - nnexpenses)))
        if(411501 <= namount <= 413200):
                 print('Your tax rate is  $119,401.25 + 35%')
                 print(float(round(namount - namount*0.35 - 119,401.25 - nnexpenses)))
        if(413201 <= namount):
                 print('Your tax rate is  $119,996.25 + 39.6%')
                 print(float(round(namount - namount*0.396 - 119,996.25 - nnexpenses)))

        #print('Annual Net Income: ', round(result,2))
     except(ValueError,NameError):
         #if(ValueError):
         print('Please enter a number and postive balance.')
         #else:
             #print('Get out of debt')