os.walk in 3.6rc1 (Windows) appears to generate different output depending on its invocation.

In the first invocation, I use the generator to yield one result at a time:
source = "C:\\cdchen_data\\downloads\\python-xlib-0.18\\"
texasranger = os.walk(Path(source))
roottree = [next(texasranger)]
roottree[0][0]
Output:
'C:\\cdchen_data\\downloads\\python-xlib-0.18'

The same result occurs when using the generator in a for loop.

In the second invocation, I generate the complete list first:
sourcetree = [x for x in os.walk(source)]
sourcetree[0][0]

Output:
'C:\\cdchen_data\\downloads\\python-xlib-0.18\\'

The particular behavior causing me trouble is the omission in the first result of the final '\\'. I checked in 2.7.6 and os.walk is consistent and I believe more correct in that it will yield equivalent results and includes the '\\'.

Not sure if earlier Python 3 implementations have this problem, I couldn't get 3.5 to run this function without failing.

Isn't the difference that you use os.walk(Path(source)) in the first example, and os.walk(source) in the second one?

Assuming Path is pathlib.Path, this is equivalent to the difference between:

>>> list(os.walk('/tmp'))
[('/tmp', <other-stuff ...>

and:
>>> list(os.walk('/tmp/'))
[('/tmp/', <other-stuff ...> 

Because:
>>> pathlib.Path('/tmp')
PosixPath('/tmp')
>>> pathlib.Path('/tmp/')
PosixPath('/tmp')

Ah, you're correct. The behavior is consistent if you use strings in both invocations. The Path conversion strips the final '\\'. Doc examples do use the names of directories rather than a Path object.

I will close the issue. Thanks for the quick response!