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Kirill Smelkov
cpython
Commits
0522fd81
Commit
0522fd81
authored
Oct 20, 2018
by
Stéphane Wirtel
Committed by
Julien Palard
Oct 20, 2018
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bpo-34839: Add a 'before 3.6' in the section 'warnings' of doctest (GH-9736)
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a5259fb0
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Doc/library/doctest.rst
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Doc/library/doctest.rst
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0522fd81
...
@@ -759,23 +759,27 @@ Warnings
...
@@ -759,23 +759,27 @@ Warnings
:mod:`doctest` is serious about requiring exact matches in expected output. If
:mod:`doctest` is serious about requiring exact matches in expected output. If
even a single character doesn't match, the test fails. This will probably
even a single character doesn't match, the test fails. This will probably
surprise you a few times, as you learn exactly what Python does and doesn't
surprise you a few times, as you learn exactly what Python does and doesn't
guarantee about output. For example, when printing a dict, Python doesn't
guarantee about output. For example, when printing a set, Python doesn't
guarantee that the key-value pairs will be printed in any particular order, so a
guarantee that the element is printed in any particular order, so a test like ::
test like ::
>>> foo()
>>> foo()
{"
Hermione
"
: "
hippogryph
", "
Harry
": "
broomstick
"}
{"
Hermione
"
, "
Harry
"}
is vulnerable! One workaround is to do ::
is vulnerable! One workaround is to do ::
>>> foo() == {"
Hermione
"
: "
hippogryph
", "
Harry
": "
broomstick
"}
>>> foo() == {"
Hermione
"
, "
Harry
"}
True
True
instead. Another is to do ::
instead. Another is to do ::
>>> d = sorted(foo()
.items()
)
>>> d = sorted(foo())
>>> d
>>> d
[('Harry', 'broomstick'), ('Hermione', 'hippogryph')]
['Harry', 'Hermione']
.. note::
Before Python 3.6, when printing a dict, Python did not guarantee that
the key-value pairs was printed in any particular order.
There are others, but you get the idea.
There are others, but you get the idea.
...
...
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