Missing attributes running pyserial under Windows 7 - windows

Question

I'm trying to run MinimalModbus (which uses pyserial under the hood) on Windows 7, and I've reduced my issue to this: Here's the contents of foo.py in its entirety:
#!/usr/bin/env python
import sys
import serial
print(sys.version)
print(serial.PARITY_NONE)
When I run foo.py, python cannot find some pyserial attributes:
E:\>py -3.6 foo.py
3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)]
Traceback (most recent call last):
File "foo.py", line 5, in <module>
print(serial.PARITY_NONE)
AttributeError: module 'serial' has no attribute 'PARITY_NONE'
When I run the same script on OS X (High Sierra, 10.13.2), I get the correct output ('N').
Here is the output of pip freeze and ver in my Windows environment:
E:\>py -3.6 -m pip freeze
future==0.16.0
iso8601==0.1.12
MinimalModbus==0.7
pyftdi==0.28.2
pyserial==3.4
pyusb==1.0.2
PyYAML==3.12
serial==0.0.27
UniCurses==1.2
E:\>ver
Microsoft Windows [Version 6.1.7601]
Any suggestions?
update
It appears that I'm getting the wrong serial module:
E:\>py -3.6
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)]
on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import serial
>>> help(serial)
Help on package serial:
NAME
serial
DESCRIPTION
``serial`` is an object serialization/deserialization library intended to fa
cilitate authoring of API models which are
readable and introspective, and to expedite code and data validation and tes
ting. ``serial`` supports JSON, YAML, and
XML.
... which isn't at all the pyserial module I've come to love. What am I missing?

Answer 1

A somewhat anticlimactic solution.
I noticed the offending serial module in the output of pip freeze:
E:\>py -3.6 -m pip freeze
future==0.16.0
iso8601==0.1.12
MinimalModbus==0.7
pyftdi==0.28.2
pyserial==3.4
pyusb==1.0.2
PyYAML==3.12
serial==0.0.27 <<< this one
UniCurses==1.2
I removed it:
py -3.6 -m pip uninstall serial
... but that didn't fix the problem. However, subsequently uninstalling and re-installing pyserial did the trick:
>>> py -3.6 -m pip uninstall pyserial
>>> py -3.6 -m pip install pyserial
>>> py -3.6 foo.py
3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)]
N
All better now!