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"Evaluation order" doc section is wrong about dicts #60981

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ezio-melotti opened this issue Dec 25, 2012 · 2 comments
Closed

"Evaluation order" doc section is wrong about dicts #60981

ezio-melotti opened this issue Dec 25, 2012 · 2 comments
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docs Documentation in the Doc dir type-feature A feature request or enhancement

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BPO 16777
Nosy @ezio-melotti, @cjerdonek
Superseder
  • bpo-11205: Evaluation order of dictionary display is different from reference manual.
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    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/ezio-melotti'
closed_at = <Date 2012-12-25.14:41:50.008>
created_at = <Date 2012-12-25.13:54:47.930>
labels = ['type-feature', 'docs']
title = '"Evaluation order" doc section is wrong about dicts'
updated_at = <Date 2012-12-25.14:41:50.006>
user = 'https://github.com/ezio-melotti'

    bugs.python.org fields:

    activity = <Date 2012-12-25.14:41:50.006>
actor = 'ezio.melotti'
assignee = 'ezio.melotti'
closed = True
closed_date = <Date 2012-12-25.14:41:50.008>
closer = 'ezio.melotti'
components = ['Documentation']
creation = <Date 2012-12-25.13:54:47.930>
creator = 'ezio.melotti'
dependencies = []
files = []
hgrepos = []
issue_num = 16777
keywords = []
message_count = 2.0
messages = ['178127', '178129']
nosy_count = 2.0
nosy_names = ['ezio.melotti', 'chris.jerdonek']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '11205'
type = 'enhancement'
url = 'https://bugs.python.org/issue16777'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3', 'Python 3.4']
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    http://docs.python.org/2/reference/expressions.html#evaluation-order
    says that the dicts are evaluated in this order:
    {expr1: expr2, expr3: expr4}

    however each value is evaluated before the respective key:
    def f(x):
    print(x)
    return x

    {f('k1'): f('v1'), f('k2'): f('v2')}

    v1
    k1
    v2
    k2
    {'k1': 'v1', 'k2': 'v2'}

    @ezio-melotti ezio-melotti self-assigned this Dec 25, 2012
    @ezio-melotti ezio-melotti added docs Documentation in the Doc dir type-feature A feature request or enhancement labels Dec 25, 2012
    @ezio-melotti
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    This has already been reported in bpo-11205.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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