Complete the following python code

# Verify that the line contains two strings separated by "@". def is_email(address): return False # YOU MUST DEFINE THE FUNCTION HERE!

# DO NOT EDIT BELOW THIS LINE! # Main program tests several different test cases test_cases = ["fred@mail.com", # True "george", # False, no @ "@randomdomain.org", # False, no user ID "expunge.bob@", # False, no domain "billybob@random@domain"] # False, more than one "@"

print("Test cases:") for case in test_cases: if is_email(case): print("'{}' is valid".format(case)) else: print("'{}' not valid".format(case))

print("Done!") # end of program

Define the function def is_email(address): that accepts a text string containing an email address and returns True if the address is valid, or False otherwise. For this problem, a valid email address must have exactly two non-empty strings with a "@" separator character. Address Return value Note fred@gmail.com True User ID @ domain george False No @ present @randomdomain.org False @present but no characters before expunge. bob@ False @ present but no characters after billybob@random@domain False More than one @ For full marks: Use the given function name and parameter names The function returns its result (not print!) The function uses the given parameters (no "reaching into the main program)