Ambiguous datetime comparisons should use == rather than 'is' for tzinfo comparison

GitHub fields:

assignee = 'https://github.com/abalkin'
closed_at = None
created_at = <Date 2016-11-03.18:37:19.485>
labels = ['3.7', 'type-bug', 'library']
title = "Ambiguous datetime comparisons should use == rather than 'is' for tzinfo comparison"
updated_at = <Date 2016-11-03.18:46:38.618>
user = 'https://github.com/pganssle'

bugs.python.org fields:

activity = <Date 2016-11-03.18:46:38.618>
actor = 'belopolsky'
assignee = 'belopolsky'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-11-03.18:37:19.485>
creator = 'p-ganssle'
dependencies = []
files = []
hgrepos = []
issue_num = 28601
keywords = []
message_count = 2.0
messages = ['280003', '280005']
nosy_count = 3.0
nosy_names = ['tim.peters', 'belopolsky', 'p-ganssle']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28601'
versions = ['Python 3.6', 'Python 3.7']