TypeError: cannot concatenate 'str' and 'instance' objects (python urllib)

Question

Writing a python program, and I came up with this error while using the urllib.urlopen function.

Traceback (most recent call last):
File "ChurchScraper.py", line 58, in <module>
html = GetAllChurchPages()
File "ChurchScraper.py", line 48, in GetAllChurchPages
CPs = CPs + urllib.urlopen(url)
TypeError: cannot concatenate 'str' and 'instance' objects


 url = 'http://website.com/index.php?cID=' + str(cID)
        CPs = CPs + urllib.urlopen(url)

Answer 1

urlopen(url) returns a file-like object. To obtain the string contents, try

CPs = CPs + urllib.urlopen(url).read()