Add xml pretty print option to ElementTree

[rhettinger]

BPO	23847
Nosy	@rhettinger, @scoder
Superseder	bpo-14465: xml.etree.ElementTree: add feature to prettify XML output

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2015-04-02.08:20:47.244>
created_at = <Date 2015-04-02.07:01:50.309>
labels = ['3.8', 'type-feature', '3.7']
title = 'Add xml pretty print option to ElementTree'
updated_at = <Date 2018-08-17.15:22:53.057>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2018-08-17.15:22:53.057>
actor = 'mcepl'
assignee = 'none'
closed = True
closed_date = <Date 2015-04-02.08:20:47.244>
closer = 'serhiy.storchaka'
components = []
creation = <Date 2015-04-02.07:01:50.309>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 23847
keywords = []
message_count = 2.0
messages = ['239879', '239881']
nosy_count = 3.0
nosy_names = ['rhettinger', 'scoder', 'eli.bendersky']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '14465'
type = 'enhancement'
url = 'https://bugs.python.org/issue23847'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[rhettinger]

The xml.dom.minidom package has as a xml.toprettyxml() function that has the problem of altering the whitespace of the text of elements. The ElementTree module needs a prettify option that works better, perhaps something based of Effbot's code at:

http://effbot.org/zone/element-lib.htm#prettyprint

The lxml package also provides an API for this purpose:

    print(etree.tostring(root, pretty_print=True))

[scoder]

duplicate of bpo-14465