flake-isort generating false warnings when running flake8 on Windows

Bug report

flake-isort is generating false warnings when running flake8 with flake8-isort installed on Windows 10 machine.

What’s wrong

Having file with the contents:

# -*- coding: UTF-8 -*-
"""Module docstring."""

print('hello')

Running

C:\Temp\SampleEnvIsortOnly\Scripts
(SampleEnvIsortOnly) λ flake8 "C:\Development\Flake8PluginDev\foo.py"

on Windows 10 gives

C:\Development\Flake8PluginDev\foo.py:2:1: I001 isort found an import in the wrong position
C:\Development\Flake8PluginDev\foo.py:4:1: I003 isort expected 1 blank line in imports, found 0

when there are really no imports in the file.

Running

(SamplePyEnv) linuxuser@LinuxMachine:~/Development/SamplePyEnv$ flake8 /home/linuxuser/Development/Sample/foo.py

on the file with the same contents on Linux Ubuntu does not produce any warnings.

How is that should be

The flake8-isort should not generate these false warnings for file with the provided content on Windows machines.

System information

flake8 information

Contents of flake8 --bug-report:

(SampleEnvIsortOnly) λ flake8 --bug-report
{
  "dependencies": [
    {
      "dependency": "setuptools",
      "version": "39.0.1"
    }
  ],
  "platform": {
    "python_implementation": "CPython",
    "python_version": "3.6.6",
    "system": "Windows"
  },
  "plugins": [
    {
      "is_local": false,
      "plugin": "flake8_isort",
      "version": "2.3"
    },
    {
      "is_local": false,
      "plugin": "mccabe",
      "version": "0.6.1"
    },
    {
      "is_local": false,
      "plugin": "pycodestyle",
      "version": "2.3.1"
    },
    {
      "is_local": false,
      "plugin": "pyflakes",
      "version": "1.6.0"
    }
  ],
  "version": "3.5.0"
}

pip information

Contents of pip freeze:

(SampleEnvIsortOnly) λ pip freeze
flake8==3.5.0
flake8-isort==2.5
isort==4.3.4
mccabe==0.6.1
pycodestyle==2.3.1
pyflakes==1.6.0
testfixtures==6.3.0

[AlexArcPy]

I’ve tried various things but this seems to be specific to my Windows 10 environment. Since if I understood it right the appveyor tests on Windows pass, this issue could be closed and no further action is required in this regard.

[sobolevn]

@AlexArcPy can this be closed? Have you figured out what was wrong?