How to use yapf in VSCode

I installed yapf using:

conda install yapf

and add next lines in my .vscode/settings.json file:

{
    //"python.linting.pylintEnabled": true,
    //"python.linting.pycodestyleEnabled": false,
    //"python.linting.flake8Enabled": true,
    "python.formatting.provider": "yapf",
    "python.formatting.yapfArgs": [
        "— style",
        "{based_on_style: pep8, indent_width: 4}"
    ],
    "python.linting.enabled": true,
}

But I can't understand how to use it - it doesn't show any error in a bad-formatted script:

import pandas as pd

class MyClass(object):
    def __init__(self, some_value: int):
        self.value = some_value
    def one_more_function(self, another_value):
        print(another_value)
myObject = MyClass(45)
myObject.one_more_function(2)
my__object2 = MyClass(324)

    print('ok')
def some_foo():
    """"""
    pass