Fix FAQ example to use __import__('functools').reduce

[wyz23x2]

BPO	41393
Nosy	@ericvsmith, @cryvate, @wyz23x2

^{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 2020-07-25.12:49:19.272>
created_at = <Date 2020-07-25.12:38:04.795>
labels = ['3.8', '3.9', '3.10', '3.7', 'invalid', 'docs']
title = "Fix FAQ example to use __import__('functools').reduce"
updated_at = <Date 2020-07-25.13:29:30.153>
user = 'https://github.com/wyz23x2'

bugs.python.org fields:

activity = <Date 2020-07-25.13:29:30.153>
actor = 'eric.smith'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-07-25.12:49:19.272>
closer = 'serhiy.storchaka'
components = ['Documentation']
creation = <Date 2020-07-25.12:38:04.795>
creator = 'wyz23x2'
dependencies = []
files = []
hgrepos = []
issue_num = 41393
keywords = []
message_count = 3.0
messages = ['374258', '374259', '374265']
nosy_count = 4.0
nosy_names = ['eric.smith', 'docs@python', 'cryvate', 'wyz23x2']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41393'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[wyz23x2]

https://docs.python.org/3/faq/programming.html#is-it-possible-to-write-obfuscated-one-liners-in-python
https://github.com/python/cpython/blob/3.8/Doc/faq/programming.rst
The 3rd raises a NameError because reduce was moved into functools. __import__('functools').reduce should fix this.

[Cryvate]

It doesn't raise an error when you run the whole example, it has "from functools import reduce" at the top.

[ericvsmith]

I agree that the example is okay as-is.

Plus, I can't see us using __import__ in examples. "import" is the preferred way to load modules.

Although now that I think about it, maybe __import__ would fit in with the subject "Is it possible to write obfuscated one-liners in Python?"!