list-user-policies Tests failing in Python 3.6

[simonw]

E             At index 4 diff: "call().get_user_policy(PolicyName='policy-one', UserName='one')"
              != "call().get_user_policy(UserName='one', PolicyName='policy-one')"

Looks like there's no guarantee to the ordering of the parameters when they are pretty-printed here:

s3-credentials/tests/test_s3_credentials.py

Lines 112 to 117 in a8e10fb

	assert [str(c) for c in boto3.mock_calls] == [
	"call()",
	"call('iam')",
	"call().get_paginator('list_users')",
	"call().get_paginator('list_user_policies')",
	"call().get_user_policy(UserName='one', PolicyName='policy-one')",

[simonw]

Since the __str__ thing described in https://til.simonwillison.net/pytest/pytest-mock-calls isn't a problem here I can ditch the str() and do a straight comparison to boto3.mock_calls.