I read the existing discussions in this group, and checked that my account's access level is Standard or Admin. But it doesn't still work.
☁ googleads-python-lib [master] python examples/adwords/v201809/account_management/get_account_hierarchy.py
No handlers could be found for logger "googleads.soap"
Traceback (most recent call last):
File "examples/adwords/v201809/account_management/get_account_hierarchy.py", line 104, in <module>
main(adwords_client)
File "examples/adwords/v201809/account_management/get_account_hierarchy.py", line 70, in main
page = managed_customer_service.get(selector)
File "/Users/takakoohshima/.pyenv/versions/anaconda3-4.3.1/lib/python2.7/site-packages/googleads/common.py", line 1396, in MakeSoapRequest
e.detail, errors=error_list, message=e.message)
googleads.errors.GoogleAdsServerFault: [AuthorizationError.SERVICE_ACCESS_DENIED @ ]