code: def run(self, block=True, binary=False, cwd=None):
          
          self.blocking = block
  
          # Use subprocess.
          if self.blocking:
              popen_kwargs = self._default_popen_kwargs.copy()
              popen_kwargs['universal_newlines'] = not binary
              if cwd:
                  popen_kwargs['cwd'] = cwd
              s = subprocess.Popen(self._popen_args, **popen_kwargs)
          # Otherwise, use pexpect.
          else:
              pexpect_kwargs = self._default_pexpect_kwargs.copy()
              if binary:
                  pexpect_kwargs['encoding'] = None
              if cwd:
                  pexpect_kwargs['cwd'] = cwd
              # Enable Python subprocesses to work with expect functionality.
              pexpect_kwargs['env']['PYTHONUNBUFFERED'] = '1'
              s = PopenSpawn(self._popen_args, **pexpect_kwargs)
          self.subprocess = s
          self.was_run = True
docs: Runs the given command, with or without pexpect functionality enabled.