Explain why it is recommended to pass args as a string rather than as a sequence If shell is True

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-04-16.03:10:04.802>
labels = ['type-feature', 'docs']
title = 'Explain why it is recommended to pass args as a string rather than as a sequence If shell is True'
updated_at = <Date 2017-04-16.16:51:02.875>
user = 'https://bugs.python.org/iMath'

bugs.python.org fields:

activity = <Date 2017-04-16.16:51:02.875>
actor = 'r.david.murray'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2017-04-16.03:10:04.802>
creator = 'iMath'
dependencies = []
files = []
hgrepos = []
issue_num = 30079
keywords = []
message_count = 5.0
messages = ['291733', '291734', '291735', '291755', '291756']
nosy_count = 4.0
nosy_names = ['r.david.murray', 'docs@python', 'eryksun', 'iMath']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30079'
versions = []