Missing line in example program

[lucbouge]

BPO	30941
Nosy	@bitdancer, @lucbouge

^{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 2017-07-16.19:33:16.579>
created_at = <Date 2017-07-16.18:24:33.397>
labels = ['type-bug', 'invalid', 'docs']
title = 'Missing line in example program'
updated_at = <Date 2017-07-16.19:33:16.577>
user = 'https://github.com/lucbouge'

bugs.python.org fields:

activity = <Date 2017-07-16.19:33:16.577>
actor = 'r.david.murray'
assignee = 'docs@python'
closed = True
closed_date = <Date 2017-07-16.19:33:16.579>
closer = 'r.david.murray'
components = ['Documentation']
creation = <Date 2017-07-16.18:24:33.397>
creator = 'lucbouge'
dependencies = []
files = []
hgrepos = []
issue_num = 30941
keywords = []
message_count = 2.0
messages = ['298445', '298447']
nosy_count = 3.0
nosy_names = ['r.david.murray', 'docs@python', 'lucbouge']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30941'
versions = ['Python 3.6']

[lucbouge]

On page <https://docs.python.org/3.6/_sources/library/stdtypes.txt\>, the following program is listed.

It raises a syntactic error.

An empty line is missing after "... n += val" to close the loop body.

   >>> # iteration
   >>> n = 0
   >>> for val in values:
   ...     n += val
   >>> print(n)
   504

[bitdancer]

This is the standard way that we write examples. Sprinkling in extra blank lines everywhere would make the examples less readable. One you've learned how the command interpreter works, the examples are clear, so you each beginner only has to learn this once (and I believe it is explained in the tutorial, though I haven't checked).