np.frombuffer has an example making a S1 array from "hello world". That works fine in Python 2, but in Python3 raises an error - the string object doesn't have a __buffer__ attribute.

 s = b'hello world' 

works.

I don't know if it is simpler to use separate PY2 and PY3 examples, or to come up with an example that doesn't highlight this difference. frombuffer is not usually needed by beginning to intermediate users, so an overly simple string/bytestring example might be more misleading than helpful.

http://stackoverflow.com/questions/43362986/numpy-frombuffer-attributeerror-str-object-has-no-attribute-buffer