I am trying to figure out how to update empty variables outside of a function in Python. The reason for this is to create a loop that queries a user about additional parameters they would be able to add.

What I have so far looks like:

```
param1 = ""
param 2 = ""
typeans = ['parameter 1', 'param 2']
typeansa = ['parameter 2', 'param 2']

def addparams():
    while True:
        again = raw_input('Would you like to add another parameter? Enter y/n: ')
        if again == "n":
            break
        if again == "y":
        additionalparams = raw_input("Would you like to add any other parameters? (Parameter 1, Parameter 2): ")
            if additionalparams.lower() in typeans:
                param1 = raw_input('Please enter the first search criteria: ')
                param1.update() = param1+"one"
            elif additionalparams.lower() in typeansa:
                param2 = raw_input('Please enter the second search criteria: ')
                param2.update() = param2+"two"
            addparams()
addparams()
url = www.website.com/+param1+param2

```

The purpose of this code would be to allow me to query the user about if they had additional parameters and then add them to a url/uri. The reason I left them blank outside of the fuction is in case the user only opted to use one of the variables or a few of them (in my real code I have 7 parameters).

I understand this may not be the best way to go about this problem and would greatly appreciate any suggestions. I am new to Python and would welcome any help.

Thanks!