Add frame command to pdb

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-11-29.17:04:25.243>
labels = ['library']
title = 'Add frame command to pdb'
updated_at = <Date 2018-11-30.08:28:29.545>
user = 'https://github.com/cklein'

bugs.python.org fields:

activity = <Date 2018-11-30.08:28:29.545>
actor = 'xtreak'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-11-29.17:04:25.243>
creator = 'cnklein'
dependencies = []
files = []
hgrepos = []
issue_num = 35353
keywords = []
message_count = 1.0
messages = ['330703']
nosy_count = 1.0
nosy_names = ['cnklein']
pr_nums = ['10799']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue35353'
versions = []