Gabor Urban <[email protected]> writes:

I am running Python 3.3 on MS Windows. Any idea why is this?

IIRC Raymond Hettinger spoke about how the rules for the ordering of
dictionaries have been changed during the development of Python.

The most recent versions of Python might retain the insertation order
while older version might follow different rules.

(Right now I cannot access the resources I usually use to
check the accuracy of what I write, so what I wrote above
has not been checked by me and might be wrong.)

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Hi guys,

I have a strange problem that I do not understand. I am testing function
which returns a dictionary. The code should ensure that the keys of the dictionary are generated in a given order.

I am testing the function with the standard unittest module and use the assertListEqual statement to verify the sequence. Sometimes this test
fails, sometimes passes without any change neither in the code, nor in the testcase. I am using "list(myDict.keys())" to create the list of the keys
of the dictionary.

I am running Python 3.3 on MS Windows. Any idea why is this?

Thx, Gabor

--
Urbán Gábor

Linux is like a wigwam: no Gates, no Windows and an Apache inside.

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Gabor Urban schreef op 4/03/2023 om 17:38:

Hi guys,

I have a strange problem that I do not understand. I am testing function which returns a dictionary. The code should ensure that the keys of the dictionary are generated in a given order.

I am testing the function with the standard unittest module and use the assertListEqual statement to verify the sequence. Sometimes this test
fails, sometimes passes without any change neither in the code, nor in the testcase. I am using "list(myDict.keys())" to create the list of the keys
of the dictionary.

I am running Python 3.3 on MS Windows. Any idea why is this?

Prior to Python 3.6 (de facto) and Python 3.7 (officially), there was no guarantee at all about the order of keys in a dict. If you need the keys
to be in the same order they were inserted, either use
collections.OrderedDict or upgrade to Python 3.7 or later.

--
"Life ain't no fairy tale
Just give me another ale
And I'll drink to Rock 'n Roll"
-- Barkeep (The Scabs)

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On 3/4/2023 11:38 AM, Gabor Urban wrote:

Hi guys,

I have a strange problem that I do not understand. I am testing function which returns a dictionary. The code should ensure that the keys of the dictionary are generated in a given order.

I am testing the function with the standard unittest module and use the assertListEqual statement to verify the sequence. Sometimes this test
fails, sometimes passes without any change neither in the code, nor in the testcase. I am using "list(myDict.keys())" to create the list of the keys
of the dictionary.

I am running Python 3.3 on MS Windows. Any idea why is this?

List order would not be guaranteed. Sort the list first. Then your
problem should clear up.

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Thomas Passin schreef op 4/03/2023 om 18:49:

On 3/4/2023 11:38 AM, Gabor Urban wrote:

Hi guys,

I have a strange problem that I do not understand. I am testing function which returns a dictionary. The code should ensure that the keys of the dictionary are generated in a given order.

I am testing the function with the standard unittest module and use the assertListEqual statement to verify the sequence. Sometimes this test fails, sometimes passes without any change neither in the code, nor in the testcase. I am using "list(myDict.keys())" to create the list of the keys of the dictionary.

I am running Python 3.3 on MS Windows. Any idea why is this?

List order would not be guaranteed. Sort the list first. Then your
problem should clear up.

How would that enable you to check that the keys in the dict are in a
specific order?

--
"Ever since I learned about confirmation bias, I've been seeing
it everywhere."
-- Jon Ronson

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On 3/4/2023 1:42 PM, Roel Schroeven wrote:

Thomas Passin schreef op 4/03/2023 om 18:49:

On 3/4/2023 11:38 AM, Gabor Urban wrote:

   Hi guys,

I have a strange problem that I do not understand. I am testing

function

which returns a dictionary. The code should ensure that the keys of the
dictionary are generated in a given order.

I am testing the function with the standard unittest module and

use the

assertListEqual statement to verify the sequence. Sometimes this test
fails, sometimes passes without any change neither in the code, nor

in the

testcase. I am using "list(myDict.keys())" to create the list of the

keys

of the dictionary.

I am running Python 3.3 on MS Windows. Any idea why is this?

List order would not be guaranteed.  Sort the list first.  Then your
problem should clear up.

How would that enable you to check that the keys in the dict are in a specific order?

I probably misunderstood. I thought you needed a list of keys in a
reproducible order, which sorting the list would achieve.

Let's back up. Why do you care about having the keys in some particular
order? And what is that order? Perhaps some other code design will
satisfy the real purpose.

Otherwise, in Python 3.7 and up dicts maintain the insertion order of
the keys. If you cannot use those versions of Python for some reason,
here's a python 2.7-compatible backport of an ordered dictionary that
you could probably adapt:

https://code.activestate.com/recipes/576693/

But note: "Dictionaries compare equal if and only if they have the same
(key, value) pairs (regardless of ordering)" (from the Python docs).

If the order you want is not the original insertion order, then you will perhaps need to adapt the ordered dict idea to your needs.

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On Sun, 5 Mar 2023 at 05:44, Roel Schroeven <[email protected]> wrote:

Thomas Passin schreef op 4/03/2023 om 18:49:

On 3/4/2023 11:38 AM, Gabor Urban wrote:

Hi guys,

I have a strange problem that I do not understand. I am testing function which returns a dictionary. The code should ensure that the keys of the dictionary are generated in a given order.

I am testing the function with the standard unittest module and use the assertListEqual statement to verify the sequence. Sometimes this test fails, sometimes passes without any change neither in the code, nor in the
testcase. I am using "list(myDict.keys())" to create the list of the keys of the dictionary.

I am running Python 3.3 on MS Windows. Any idea why is this?

List order would not be guaranteed. Sort the list first. Then your problem should clear up.

How would that enable you to check that the keys in the dict are in a specific order?

In Python 3.3, the keys in a dict are not in a specific order. There
is nothing to test.

ChrisA

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