Python:未知语法错误(简单)

Question

我在单词rental上遇到语法错误，我根本不知道自己做错了什么。这就像是我的第六个节目。任何建议都是有用的。

#Computes Cable Bill
print("Welcome to cable customer billing calculator")
acct = int(input("Enter an account number"))
cust_type = input("Enter customer type: (R) Residential or (B) Business: ")
def residential():
    processing = 4.50
    basic_service = 20.50
    daily_rental = 2.99
    prem_channel_fee = 7.50
    prem_channels = int(input("Enter the number of premium channels used: ")
    rental = int(input("Were movies rented (Y or N): ")
        if rental == Y or y:
            rental_days = int(input("Enter the total number of rental days (one day for each movie, each day): ")
        else:
            rental_days = 0
    bill_amt = processing + basic_service + (rental_days * daily_rental) + (prem_channels * prem_channel_fee)
    return (bill_amt)
def business():
    processing = 15
    basic_service = 75
    prem_channel_fee = 50
    connections = int(input("Enter the number of basic service connections: ")
    prem_channels = int(input("Enter the number of premium channels used: ")
        if (connections <= 10):
            bill_amt = processing + basic_service + (prem_channel * prem_channel_fee)
        else:
            bill_amt = processing + basic_service + ((connections - 10) * 5) + (prem_channel * prem_channel_fee)
    return (bill_amt)
if (cust_type == "R" or "r"):
    bill_total = residential()
else:
    bill_total = business()
print("Account number: ", acct)
print("Amount due: ",bill_total)

Answer 1

您需要添加右括号，如下面的代码段所示，并确保条件语句的第一行与前一行对齐。此外，考虑将rental的值与有效响应列表进行匹配——这是编写您提出的逻辑的更Python的方式：

prem_channels = int(input("Enter the number of premium channels used: "))
rental = int(input("Were movies rented (Y or N): "))
if rental in ['Y', 'y']:
    rental_days = input("Enter the total number of rental days (one day for each movie, each day): ")

同样，以下几行也需要括号：

connections = int(input("Enter the number of basic service connections: "))
prem_channels = int(input("Enter the number of premium channels used: "))

如上所述替换您的最终条件的逻辑：

if (cust_type in ["R", "r"]):

或者，或者（但不太像Python）：

if (cust_type == "R" or cust_type == "r"):

最后，请注意，input("Were movies rented (Y or N): ")返回一个字符串，因此应该将而不是强制转换为整数。如果使用int()进行强制转换，则会收到类型错误，并且if rental in ['Y', 'y']:永远不会计算为true。

Answer 2

if rental == 'Y' or rental == 'y':

应该解决这个

Answer 3

以下内容应该会对您有所帮助。

rental = str(input("Were movies rented (Y or N): "))
if rental == "Y" or rental == "y":

zeantsoi提出的积分也是有效的。也请考虑一下。

Answer 4

有许多错误：

• prem_channels = int(input("Enter the number of premium channels used: ")需要右括号
• rental = int(input("Were movies rented (Y or N): ")移除int(。输入是一个字符串
• if rental == Y or y:应该是if rental == 'Y' or rental == 'y':
• 整个CCD_ 11块需要未凹陷以与前一行对齐

• 以下两行需要尾随):

  connections=int（input（"输入基本服务连接数："）
  prem_channels=int（输入（"输入使用的高级频道数："）

• if (connections块需要未凹陷以与前一行对齐。

• if (cust_type == "R" or "r"):应为if cust_type == 'R' or cust_type == 'r':
• CCD_ 16的计算都需要使用CCD_ 17而不是CCD_

此外，if语句和返回值周围的括号是不必要的。

以下是您的代码与上述修复：

#Computes Cable Bill
print("Welcome to cable customer billing calculator")
acct = int(input("Enter an account number"))
cust_type = input("Enter customer type: (R) Residential or (B) Business: ")
def residential():
    processing = 4.50
    basic_service = 20.50
    daily_rental = 2.99
    prem_channel_fee = 7.50
    prem_channels = int(input("Enter the number of premium channels used: "))
    rental = input("Were movies rented (Y or N): ")
    if rental == 'Y' or rental == 'y':
        rental_days = int(input("Enter the total number of rental days (one day for each movie, each day): "))
    else:
        rental_days = 0
    bill_amt = processing + basic_service + (rental_days * daily_rental) + (prem_channels * prem_channel_fee)
    return bill_amt
def business():
    processing = 15
    basic_service = 75
    prem_channel_fee = 50
    connections = int(input("Enter the number of basic service connections: "))
    prem_channels = int(input("Enter the number of premium channels used: "))
    if connections <= 10:
        bill_amt = processing + basic_service + (prem_channels * prem_channel_fee)
    else:
        bill_amt = processing + basic_service + ((connections - 10) * 5) + (prem_channels * prem_channel_fee)
    return bill_amt
if cust_type == "R" or cust_type == "r":
    bill_total = residential()
else:
    bill_total = business()
print("Account number: ", acct)
print("Amount due: ",bill_total)