错字不是可订阅的

Question

我想从此计算器计算应纳税所得额，而且我一直收到错误消息“错字不是可下载的”。该错误出现在calcPEP函数中。我试图从我的TaxReturn对象中将AGI传递到我的计算器中，以计算免除的逐步淘汰，并随后计算应纳税所得额。

class TaxReturn: 
    def __init__(self, AGI): 
     self.AGI = AGI 

#import math program to retrieve rounding function 
import math 
#assign name to TaxReturn class 
txreturn = TaxReturn() 
#class for pesonal exemption phaseout (PEP) 
class PEP: 
#define phase in rate, personal exemption amount, AGI phaseout thresholds 
    def __init__(self, phase_in_rate, personal_exemption, dependents): 

     self.phase_in_rate = phase_in_rate 
     self.personal_exemption = personal_exemption 
     self.dependents = dependents 

    #calculate PEP using AGI attribute from TaxReturn object 
    def calcPEP (phase_in_rate, personal_exemption, dependents, txreturn): 
     #thresholds by filer status where PEP phase-outs begin 
     #[single, HOH, married joint, married separate] 
     phase_out_threshold = int[258250, 284050, 309900, 154950] 
     for i in phase_out_threshold: 
      if txreturn.AGI >= phase_out_threshold:  
       #calculate the amount to which PEP applies      
       PEP_amount = txreturn.AGI - i 
       #calculate PEP multiplier 
       PEP_amount /= 2500 
       #round up PEP multplier 
       PEP_amount = math.ceil(PEP_amount)    
       PEP_amount = (PEP_amount*phase_in_rate)/100 
       #calculate total reduction of exemptions 
       PEP_amount *= personal_exemption*dependents 
       #calculate taxable income 
       if personal_exemption*dependents - PEP_amount > 0: 
        taxable_inc = txreturn.AGI - (personal_exemption*dependents - PEP_amount)      
       else: 
        taxable_inc = txreturn.AGI 

      else: taxable_inc = txreturn.AGI - personal_exemption*dependents 

      return taxable_inc 

testPEP = PEP(2, 4000, 2) 
print(testPEP.calcPEP(4000, 2, 350000)) 

Answer 1

可能会更多，但我确实在那里看到math.ceil(PEP_amount) = PEP_amount。您需要在此处交换左侧和右侧，因为您无法为函数调用分配值，如错误消息所述。

Answer 2

语法错误上方的行显示问题行;

math.ceil(PEP_amount) = PEP_amount 

不能赋值给一个函数调用，我的猜测是，你有它向后：

PEP_amount = math.ceil(PEP_amount)