py.test occurred error in selenium "AttributeError: 'NoneType' object has no attribute 'fork_exec'"

[neoneo40]

from time import sleep

from good.common import Date

def test_example(selenium):
    # print(base_url)
    base_url = 'http://google.com'
    selenium.get('{0}'.format(base_url))
    sleep(2)

Error

• I tried to delete "from good.common import Date". didn't occurred error.
• I wrote "from good.common import Date" in source then error occurred.
• I don't know why error occurred.

(reservation)λ ~/PycharmProjects/reservation/ master* py.test tests/test_selenium.py -s --driver Firefox
============================================== test session starts ===============================================
platform darwin -- Python 3.5.0, pytest-2.8.5, py-1.4.31, pluggy-0.3.1
rootdir: /Users/re4lfl0w/PycharmProjects/reservation, inifile:
plugins: capturelog-0.7, cov-2.2.0, django-2.9.1, html-1.7, selenium-1.1, variables-1.3, xdist-1.13.1
collected 1 items

tests/test_selenium.py E

===================================================== ERRORS =====================================================
_________________________________________ ERROR at setup of test_example _________________________________________

request = <SubRequest 'selenium' for <Function 'test_example'>>, capabilities = {}

    @pytest.fixture
    def selenium(request, capabilities):
        """Returns a WebDriver instance based on options and capabilities"""
        from .driver import start_driver
>       driver = start_driver(request.node, capabilities)

../../.virtualenvs/reservation/lib/python3.5/site-packages/pytest_selenium/pytest_selenium.py:75:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
../../.virtualenvs/reservation/lib/python3.5/site-packages/pytest_selenium/driver.py:26: in start_driver
    options.driver.lower()))(item, _capabilities)
../../.virtualenvs/reservation/lib/python3.5/site-packages/pytest_selenium/driver.py:66: in firefox_driver
    return webdriver.Firefox(**kwargs)
../../.virtualenvs/reservation/lib/python3.5/site-packages/selenium/webdriver/firefox/webdriver.py:78: in __init__
    self.binary, timeout)
../../.virtualenvs/reservation/lib/python3.5/site-packages/selenium/webdriver/firefox/extension_connection.py:49: in __init__
    self.binary.launch_browser(self.profile)
../../.virtualenvs/reservation/lib/python3.5/site-packages/selenium/webdriver/firefox/firefox_binary.py:67: in launch_browser
    self._start_from_profile_path(self.profile.path)
../../.virtualenvs/reservation/lib/python3.5/site-packages/selenium/webdriver/firefox/firefox_binary.py:90: in _start_from_profile_path
    env=self._firefox_env)
/usr/local/Cellar/python3/3.5.0/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py:950: in __init__
    restore_signals, start_new_session)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <subprocess.Popen object at 0x10640d048>
args = ['/Applications/Firefox.app/Contents/MacOS/firefox-bin', '-foreground']
executable = b'/Applications/Firefox.app/Contents/MacOS/firefox-bin', preexec_fn = None, close_fds = True
pass_fds = (), cwd = None
env = {'Apple_PubSub_Socket_Render': '/private/tmp/com.apple.launchd.dnGQ9QgDof/Render', 'COMMAND_MODE': 'unix2003', 'COMP_WORDBREAKS': '', 'DISPLAY': '/private/tmp/com.apple.launchd.y0hUNcloen/org.macosforge.xquartz:0', ...}
startupinfo = None, creationflags = 0, shell = False, p2cread = -1, p2cwrite = -1, c2pread = -1, c2pwrite = 6
errread = -1, errwrite = 6, restore_signals = True, start_new_session = False

    def _execute_child(self, args, executable, preexec_fn, close_fds,
                       pass_fds, cwd, env,
                       startupinfo, creationflags, shell,
                       p2cread, p2cwrite,
                       c2pread, c2pwrite,
                       errread, errwrite,
                       restore_signals, start_new_session):
        """Execute program (POSIX version)"""

        if isinstance(args, (str, bytes)):
            args = [args]
        else:
            args = list(args)

        if shell:
            args = ["/bin/sh", "-c"] + args
            if executable:
                args[0] = executable

        if executable is None:
            executable = args[0]
        orig_executable = executable

        # For transferring possible exec failure from child to parent.
        # Data format: "exception name:hex errno:description"
        # Pickle is not used; it is complex and involves memory allocation.
        errpipe_read, errpipe_write = os.pipe()
        # errpipe_write must not be in the standard io 0, 1, or 2 fd range.
        low_fds_to_close = []
        while errpipe_write < 3:
            low_fds_to_close.append(errpipe_write)
            errpipe_write = os.dup(errpipe_write)
        for low_fd in low_fds_to_close:
            os.close(low_fd)
        try:
            try:
                # We must avoid complex work that could involve
                # malloc or free in the child process to avoid
                # potential deadlocks, thus we do all this here.
                # and pass it to fork_exec()

                if env is not None:
                    env_list = [os.fsencode(k) + b'=' + os.fsencode(v)
                                for k, v in env.items()]
                else:
                    env_list = None  # Use execv instead of execve.
                executable = os.fsencode(executable)
                if os.path.dirname(executable):
                    executable_list = (executable,)
                else:
                    # This matches the behavior of os._execvpe().
                    executable_list = tuple(
                        os.path.join(os.fsencode(dir), executable)
                        for dir in os.get_exec_path(env))
                fds_to_keep = set(pass_fds)
                fds_to_keep.add(errpipe_write)
>               self.pid = _posixsubprocess.fork_exec(
                        args, executable_list,
                        close_fds, sorted(fds_to_keep), cwd, env_list,
                        p2cread, p2cwrite, c2pread, c2pwrite,
                        errread, errwrite,
                        errpipe_read, errpipe_write,
                        restore_signals, start_new_session, preexec_fn)
E                       AttributeError: 'NoneType' object has no attribute 'fork_exec'

/usr/local/Cellar/python3/3.5.0/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py:1473: AttributeError

[RonnyPfannschmidt]

looks like a broken interpreter, not pytest

[RonnyPfannschmidt]

im closing this as the error does not come from pytest itself and no further feedback was provided