Python帮助-具有“分配前引用的局部变量”
我在外壳上说在赋值之前引用了局部变量时遇到了问题，并且觉得之前的答案都没有帮助。我可以对此代码提出一些具体建议吗？
错误：TotalExcessCharge = ExcessOneCharge + ExcessTwoCharge + ExcessThreeCharge + ExcessFourCharge + ExcessFiveCharge + ExcessPlusLimitCharge UnboundLocalError：局部变量'ExcessThreeCharge'在分配前被引用
def BillingSystem(CustomerName,CustomerType,TotalGBUsed):
StandardCustomer = 1500
StandardQuota = 25
PremiumCustomer = 2500
PremiumQuota = 50
if (CustomerType == "Standard") or (CustomerType == "standard"):
if (TotalGBUsed > StandardQuota):
ExcessGB = TotalGBUsed - StandardQuota
for a in range(0, ExcessGB):
if (a <= 10):
ExcessOne = 250
ExcessOneCharge = a * ExcessOne
for b in range(0, ExcessGB):
if (b > 10) and (b <= 20):
ExcessTwo = 500
ExcessTwoCharge = b * ExcessTwo
for c in range(0, ExcessGB):
if (c > 20) and (c <= 30):
ExcessThree = 750
ExcessThreeCharge = c * ExcessThree
for d in range(0, ExcessGB):
if (d > 30) and (d <= 40):
ExcessFour = 1000
ExcessFourCharge = d * ExcessFour
for e in range(0, ExcessGB):
if (e > 40) and (e <= 50):
ExcessFive = 1250
ExcessFiveCharge = e * ExcessFive
for explus in range(0, ExcessGB):
if (explus > 50):
ExcessPlusLimit = 1500
ExcessPlusLimitCharge = explus * ExcessPlusLimit
TotalExcessCharge = ExcessOneCharge + ExcessTwoCharge + ExcessThreeCharge + ExcessFourCharge + ExcessFiveCharge + ExcessPlusLimitCharge
TotalCharge = StandardCustomer + TotalExcessCharge
print ("Total Excess Charge : " + str(TotalExcessCharge))
print ("Total Charge for this month : " + str(TotalCharge))
else:
print ("Total Excess Charge : 0")
print ("Total Charge for this month : " + str(StandardCustomer))
CName = input("[!] Customer Name : ")
CType = input("[!] Customer Type : ")
TotGB = int(input("[!] Total GB Usage : "))
BillingSystem(CName,CType,TotGB)
问题来源：stackoverflow
写回答
-
这里的问题是，当您的代码没有进入if条件时，您的变量永远不会被初始化，但是您在最后引用了它们。已分配。始终确保引用分配的变量！
而且您还可以使代码更易于阅读，例如
- 直接在if条件内使用多余的#值，而不将其分配给变量。
-
对输入字符串使用 转化为大小写一致后 一次性比较。。
def BillingSystem(CustomerName,CustomerType,TotalGBUsed): StandardCustomer = 1500 StandardQuota = 25 PremiumCustomer = 2500 PremiumQuota = 50
ExcessOneCharge=0 ExcessTwoCharge=0 ExcessThreeCharge=0 ExcessFourCharge=0 ExcessFiveCharge=0 ExcessPlusLimitCharge=0 if (CustomerType.upper() == "STANDARD"): if (TotalGBUsed > StandardQuota): ExcessGB = TotalGBUsed - StandardQuota for a in range(0, ExcessGB): if (a <= 10): ExcessOneCharge = a * 250 elif (a > 10) and (a <= 20): ExcessTwoCharge = (a - 10) * 500 elif (a > 20) and (a <= 30): ExcessThreeCharge = (a - 20) * 750 elif (a > 30) and (a <= 40): ExcessFourCharge = (a - 30) * 1000 elif (a > 40) and (a <= 50): ExcessFiveCharge = (a - 40) * 1250 elif (a > 50): ExcessPlusLimitCharge = (a - 50) * 1500 TotalExcessCharge = ExcessOneCharge + ExcessTwoCharge + ExcessThreeCharge + ExcessFourCharge + ExcessFiveCharge + ExcessPlusLimitCharge TotalCharge = StandardCustomer + TotalExcessCharge print ("Total Excess Charge : ", TotalExcessCharge) print ("Total Charge for this month : ", TotalCharge) else: print ("Total Excess Charge : 0") print ("Total Charge for this month : ", StandardCustomer)CName = input("[!] Customer Name : ") CType = input("[!] Customer Type : ") TotGB = int(input("[!] Total GB Usage : ")) BillingSystem(CName,CType,TotGB)
而且，除了创建ExcessOneCharge，ExcessTwoCharge变量等之外，您还可以执行以下操作：
TotalExcessCharge = 0 #don't forget to initiate the variable at the beginning of the function #then inside the if conditions TotalExcessCharge += a\*xcess#这只是如何编写更简洁的代码的示例...您可以根据需要应用逻辑！
注意：我在手机上输入所有内容，因此请忽略错别字...
回答来源：stackoverflow
2020-03-24 21:37:38赞同 展开评论 打赏
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