random.choices(seq, k)

[tiran]

BPO	18414
Nosy	@rhettinger, @mdickinson, @pitrou, @tiran
Files	random_choices.patch

^{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 = 'https://github.com/rhettinger'
closed_at = <Date 2013-07-11.10:23:14.156>
created_at = <Date 2013-07-09.13:11:25.594>
labels = ['type-feature', 'library']
title = 'random.choices(seq, k)'
updated_at = <Date 2013-07-11.10:23:14.155>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2013-07-11.10:23:14.155>
actor = 'christian.heimes'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2013-07-11.10:23:14.156>
closer = 'christian.heimes'
components = ['Library (Lib)']
creation = <Date 2013-07-09.13:11:25.594>
creator = 'christian.heimes'
dependencies = []
files = ['30877']
hgrepos = []
issue_num = 18414
keywords = ['patch']
message_count = 4.0
messages = ['192747', '192781', '192847', '192860']
nosy_count = 4.0
nosy_names = ['rhettinger', 'mark.dickinson', 'pitrou', 'christian.heimes']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue18414'
versions = ['Python 3.4']

[tiran]

The random module has no method to obvious way to select k elements from a sequence without enforcing unique values in the result set. It's a rather useful feature for salts, randomly generated passwords and other applications. See bpo-18405

The patch implements random.choices(seq, k) -> list

[pitrou]

How about [random.choice(seq) for i in range(k)]? Isn't it obvious enough?

[rhettinger]

I concur with Antoine. A list comprehension is the standard, obvious idiom for making a list from repeated function calls.

Putting sampling without replacement in its own method makes the operation more opaque than a plain list comprehension (which doesn't need documentation to be clear about how many calls are made, what the output type is, its relationship to random.choice, whether k can be larger than the population, etc).

[tiran]

You have convinced me. It's not worth yet another API method.