AttributeError: 'callable_ iterator' object has no attribute 'next'

python finditer().next() The error of

Version of the problem
python2.2 Time to join finditer()
Two ways of writing
Actually measured python3 The way of writing is

str = 'this and that'
res = re.finditer(r'(th\w+) and (th\w+)',str,re.I)# Pay attention to the version problem in this place 
print(next(res).group(1))