weird pylint contextmanager-decorators setting

[raytroop]

I'm using tensorflow eager import tensorflow.contrib.eager as tfe, but pylint raise E0611:No name 'eager' in module 'LazyLoader'.
Then I googling for solution and get one i.e. contextmanager-decorators=contextlib.contextmanager, tf_contextlib.contextmanager

weird thing come out, I have to insert "----contextmanager-decorators=contextlib.contextmanager, tf_contextlib.contextmanager, tensorflow.python.util" heading with 4 dash in "python.linting.pylintArgs"

eager_test.py

import tensorflow.contrib.eager as tfe
import tensorflow as tf
import numpy as np
tf.enable_eager_execution()

def square_f(W):
  # Return a tensor with elements squared
  return tf.square(W)

f_grad = tfe.gradients_function(square_f, params=['W'])
print(f_grad(tf.constant(0.3)))

setting.json

// Whether to lint Python files.
    "python.linting.enabled": true,
    "python.linting.pylintArgs":
    [
        // https://github.com/PyCQA/pylint/issues/1542#issuecomment-321901891
        // Dont work heading with 2 dash
        // "--contextmanager-decorators=contextlib.contextmanager, tf_contextlib.contextmanager, tensorflow.python.util",
        // workaround, weird `----`
        "----contextmanager-decorators=contextlib.contextmanager, tf_contextlib.contextmanager, tensorflow.python.util",

        // # List of members which are set dynamically and missed by pylint inference
        // # system, and so shouldn't trigger E1101 when accessed. Python regular
        // # expressions are accepted.
        "--generated-members=matplotlib.*, torch.*, pygame.*, tensorflow.*",

        // C0103:Constant name "rnd_clf" doesn't conform to UPPER_CASE naming style
        // C0111:Missing module docstring
        // R0913:Too many arguments (max=5)
        "--disable=C0103, C0111, R0913",

    ],

tensorflow-gpu == 1.10.0
pylint == 2.0.1
python == 3.5.5