Adding if or try except blok in python function

Question

I got this question i'm a little unsure how to solve:

"There are a NoneType error when reproducing the code. The getaddressdata() returns a None value. This can be fixed by adding an if-statement in the getpricelist() to see if the data is None. Use a try except block to handle invalid data."

Have to fix this before my code can run.

my function / code you see here:

def getpricelist( ):
    l1=[]
    for line in file('addresslist.txt'):
        data=getaddressdata(line.strip( ),'Cambridge,MA')
        if data != 'None':
            l1.append(data)    

    return l1

Where do i make the try / except blok??

Answer 1

You should use pythonic idiom is None to check if the variable is of a NoneType or not:

data = getaddressdata(line.strip( ),'Cambridge,MA')
if data is not None:
    l1.append(data) 

Also see:

• not None test in Python
• What is the difference between " is None " and " ==None "

Hope that helps.