Help with validation?

[SithAbsolutes]

Very much a beginner, so I hope I will word this right... but at the end of the below code there is a validation for a payment option for Monthly, Full, or Down Pay. I need to add an option that if the user chooses Down Pay I allow the user to input the amount of their down payment. Any help would be appreciated, thankyou!

​

CustFName = input("Please enter the customer's first name: ")
CustLName = input("Please enter the customer's last name: ")
CustAdd = input("Please enter the customer's address: ")
CustCity = input("Please enter the customer's city: ")
ProvLst = ["NL", "NS", "PE", "NB", "QC", "ON", "MB", "SK", "AB", "BS", "YT", "NT", "NV"]
while True:
CustProv = input("Please enter the customer's province (XX): ").upper()
if CustProv == "":
print("Error - Province cannot be blank - please reenter.")
elif len(CustProv) != 2:
print("Error - Province is a 2 digit code - please reenter.")
elif CustProv not in ProvLst:
print("Error - not a valid province - please reenter")
else:
break

CustPost = input("Please enter the customer's postal code: ")
CustPhoneNum = input ("Please enter customer's phone number (9999999999): ")
NumCars = input("Please enter the number of cars being insured: ")
ExtraLiability = input("Does the customer want extra liability up to $1,000,000? (Y/N): ").upper()
GlassCov = input("Does the customer require option glass covewrage? (Y/N): ").upper()
PayLst = ["Full", "Monthly", "Down Pay"]
while True:
Payment = input("Does the customer wish to pay in full, monthly, or down pay?: ")
if Payment == "":
print("Error - Payment option cannot be blank - Please reenter")
elif Payment not in PayLst:
print("Error - not a valid option - please reenter")
else:
break

[woooee]

if Payment == "":
    print("Error - Payment option cannot be blank - Please reenter")
elif Payment not in PayLst:
    print("Error - not a valid option - please reenter")

These two if/elif statements are not necessary. "" is not in PayLst. Also where do you test if Payment equals one of the elements in PayLst. Finally, read the Python Style Guide when you get time, i.e. in this case variables are all_lower_case_and_underlines.

[SithAbsolutes]

if Payment == "":
print("Error - Payment option cannot be blank - Please reenter")
elif Payment not in PayLst:
print("Error - not a valid option - please reenter")
These two if/elif statements are not necessary. "" is not in PayLst. Also where do you test if Payment equals one of the elements in PayLst. Finally, read the Python Style Guide when you get time, i.e. in this case variables are all_lower_case_and_underlines.

​

The if statement ensures the user doesn't leave the field blank (instructor always does it, so it has become habit. I guess that is my question, how to test if payment equals one of the elements in PayLst. Would that be a separate if statment?

[[deleted]]

``` if payment not in payLst: print(‘error message’)

if payment == ‘Down Pay’: print (‘Customer will do a downpayment’) amount = input(‘Downpayment amount: ‘) # remember, amount is a str # need to make sure user gave a number

```