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Task with path arguments including backslash fails in Windows

See original GitHub issue

Problem

If I run a taskipy task with path argument(s) including backslash, specified file path is not found and the task fails. This problem happens both in command prompt (cmd.exe) and in PowerShell (powershell.exe).

Step to reproduce

Create a new project with poetry and install latest taskipy.

> poetry new demo
> cd demo
> poetry install
> poetry add --dev taskipy

And edit pyproject.toml as below.

[tool.poetry]
name = "demo"
version = "0.1.0"
description = ""
authors = ["demo <foobar@example.com>"]

[tool.poetry.dependencies]
python = "^3.8"

[tool.poetry.dev-dependencies]
pytest = "^5.2"
taskipy = "^1.5.0"

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

[tool.taskipy.tasks]
test = 'python -m pytest'

Then run test task with a path argument, it fails.

> poetry run task test .\tests\test_demo.py
============================================ test session starts ============================================
platform win32 -- Python 3.8.5, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
rootdir: C:\Users\demo\tmp\demo
collected 0 items

=========================================== no tests ran in 0.00s ===========================================
ERROR: file not found: '.\tests\test_demo.py'

Environment

OS: Windows 10 20H2
Windows Build Number: 19042.630
Python: 3.8.5
Poetry: 1.1.4
taskipy: 1.5.0

PowerShell Version

> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      5.1.19041.610
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.19041.610
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1