How to check the values of multiple variables at once?

I need to check the value of all 3 variables(username, password, secret). If a value is NA then I need to execute a print statement or else some condition needs to be executed.

Example 1:

username = person1
password = pass1
secret   = NA

Example 2:

username = person1
password = pass1
secret   = secret1

Example

#value = Check all 3 variables for NA value
if value is NA:
   print("NA Block")
else:
    print("Value Block")
    #Calling some function

How to check the value of those variables all at once?

Answer

You could use the in operator to check whether a value is "NA". Like so:

if "NA" in (username, password, secret):  
    print("NA Block")
else:
    print("Value Block")
    #Calling some function