.poetry/lib/poetry/_vendor/py2.7/subprocess32.py:149: RuntimeWarning:

After installing Poetry with:

$ curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python

or

$ curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python3

I see this warning:

$ poetry --version
~/.poetry/lib/poetry/_vendor/py2.7/subprocess32.py:149: RuntimeWarning: The _posixsubprocess module is not being used. Child process reliability may suffer if your program uses threads.
  "program uses threads.", RuntimeWarning)
Poetry version 1.0.3

$ uname -srvmo
Linux 5.3.0-40-generic #32~18.04.1-Ubuntu SMP Mon Feb 3 14:05:59 UTC 2020 x86_64 GNU/Linux

Not sure why there is this warning???

[rinoguchi]

When I downloaded the latest get-poetry.py and installed by python3 get-poetry.py in Ubuntu, same error still occurred.

$ poetry --version
/home/xxx/.poetry/lib/poetry/_vendor/py2.7/subprocess32.py:149: RuntimeWarning: The _posixsubprocess module is not being used. Child process reliability may suffer if your program uses threads.
  "program uses threads.", RuntimeWarning)
Poetry version 1.0.9

I changed get-poetry.py as follows (around L.593), and this problem was solved.

-        allowed_executables = ["python", "python3"]
+        allowed_executables = ["python3", "python"]

[adonmez16]

1. download get-poetry.py:

curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py > get-poetry.py

1. Edit get-poetry.py on line 200: from BIN = """#!/usr/bin/env python to BIN = """#!/usr/bin/env python3

ps. f-string modification doesn’t work on Python3.8