os.path.join() return wrong value in windows

[quangnt]

BPO	31617
Nosy	@pfmoore, @tjguk, @zware, @eryksun, @zooba, @quangnt

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-09-28.11:33:46.854>
created_at = <Date 2017-09-28.11:09:21.340>
labels = ['type-bug', 'invalid', 'OS-windows']
title = 'os.path.join() return wrong value in windows'
updated_at = <Date 2017-09-28.11:33:46.852>
user = 'https://github.com/quangnt'

bugs.python.org fields:

activity = <Date 2017-09-28.11:33:46.852>
actor = 'eryksun'
assignee = 'none'
closed = True
closed_date = <Date 2017-09-28.11:33:46.854>
closer = 'eryksun'
components = ['Windows']
creation = <Date 2017-09-28.11:09:21.340>
creator = 'triquang'
dependencies = []
files = []
hgrepos = []
issue_num = 31617
keywords = []
message_count = 2.0
messages = ['303216', '303223']
nosy_count = 6.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'eryksun', 'steve.dower', 'triquang']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31617'
versions = ['Python 2.7']

[quangnt]

In windows if we use os.path.join('C:\\Test\\UnitTest', '/Page') ==> It returns 'C:/Page' ==> It should be 'C:\\Test\\UnitTest/Page'.

[eryksun]

This is explained in the docs:

Join one or more path components intelligently.... If a 
component is an absolute path, all previous components are 
thrown away and joining continues from the absolute path 
component. On Windows, the drive letter is not reset when 
an absolute path component (e.g., r'\foo') is encountered.