pyenv activate for bash and tcsh

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-07-03.19:36:47.175>
labels = ['type-feature', '3.7']
title = 'pyenv activate for bash and tcsh'
updated_at = <Date 2020-09-13.20:56:35.604>
user = 'https://bugs.python.org/PyAcrisel'

bugs.python.org fields:

activity = <Date 2020-09-13.20:56:35.604>
actor = 'vinay.sajip'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2017-07-03.19:36:47.175>
creator = 'PyAcrisel'
dependencies = []
files = []
hgrepos = []
issue_num = 30842
keywords = []
message_count = 9.0
messages = ['297611', '298351', '298377', '298382', '299463', '299466', '299513', '299527', '376854']
nosy_count = 2.0
nosy_names = ['vinay.sajip', 'PyAcrisel']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30842'
versions = ['Python 3.7']