def __init__(self, executable, args, env):
self._executable = distutils.spawn.find_executable(executable)<EOL>self._args = args<EOL>self._env = env<EOL>self._open_process()<EOL>
:param str executable: command name to execute *Vim*
:param args: arguments to execute *Vim*
:type args: None or string or list of string
:param env: environment variables to execute *Vim*
:type env: None or dict of (string, string)