Arcmap: Unable to detect empty value in row using Field Calculator

Question

I am using the following pre-logic Python code to try to catch Null, empty, or "0" string values in the "street" column and then return a "V" value if it is one of those. While the code runs and works on some rows, it doesn't seem to be catching all empty cells. Am I missing a case? Or could it be that there are multiple spaces, and if so, how can I check for those?

Pre-Logic:

def check(Street):
  if Street is None or Street == "" or Street == "0" or Street == None or not Street or Street == " ":
    return "V" 
  else:
    return " "

Verfied =

check(!Street1!)

Answer 1

The strip method on a string will remove spaces and linebreaks so you can use it in your case to check for cases of multiple spaces.

def check(Street):
  if Street is None or Street.strip() == "" or Street == "0":
    return "V" 
  else:
    return " "