In python 2 type str means bytes and type unicode means unicode
In python 3 class bytes means bytes and class str means unicode.
This is my biggest problem with py3. They changed the meaning of a keyword
to mean the opposite of what it did in py2. It makes things really hard to
debug.
On Friday, 11 October 2019 04:58:40 UTC-7, Lisandro wrote:
>
> > Also in your json example you are getting unicode both in py2 and py3
> except py3 does not put the u'' in front of unicode strings because they
> are default.
>
> I've used type() to inspect the keys and values of the dictionary in py2
> and py3:
>
> *py2*
> >>> map = pickle.load(open(path, 'rb'))
> >>> first_key = list(map.keys())[0]
> >>> print(type(first_key))
> <type 'unicode'>
> >>> print(type(map[first_key]))
> <type 'unicode'>
>
>
> *py3*
> >>> map = pickle.load(open(path, 'rb'))
> >>> first_key = list(map.keys())[0]
> >>> print(type(first_key))
> <class 'str'>
> >>> print(type(map[first_key]))
> <class 'str'>
>
> Notice in python3 it says "class" not "type" and it is str, while on
> python2 it says unicode :/
>
> Anyway, I don't pretend to bother with this issue unrelated to web2py.
> My goal is to be able to read/write the dicti to a .pkl file with py2 and
> py3, so I'll keep testing and I'll post the solution here if I find it :)
>
>
>
> El viernes, 11 de octubre de 2019, 2:52:35 (UTC-3), Massimo Di Pierro
> escribió:
>>
>> I am puzzled by this too. The error is not in web2py code. The error is
>> in the string.py module.
>> Also in your json example you are getting unicode both in py2 and py3
>> except py3 does not put the u'' in front of unicode strings because they
>> are default.
>>
>> On Thursday, 10 October 2019 18:05:55 UTC-7, Lisandro wrote:
>>>
>>> I've found the issue, it's not web2py related, sorry about that.
>>>
>>> My web2py instance has several applications running, each one is
>>> attached to a domain.
>>> I store a the map of domains:apps in a dictionary that I save to a .pkl
>>> file.
>>> Then my routes.py reads that file and loads the map of domains:apps
>>>
>>> I write the .pkl file like this:
>>>
>>> with open('map.pkl', 'wb') as file:
>>> pickle.dump(dictionary_map, file, protocol=2)
>>>
>>> Notice I use protocol=2 because I want to be able to read/write the file
>>> with python 2 and 3.
>>>
>>> In my routes.py I read the file like this:
>>>
>>> map = pickle.load(open('domains_apps.pkl', 'rb'))
>>>
>>> routers = dict(
>>> BASE=dict(
>>> default_controller='default',
>>> default_function='index',
>>> domains=map,
>>> map_static=True,
>>> exclusive_domain=True,
>>> )
>>> )
>>>
>>>
>>>
>>> However, after writing .pkl the file with python 3 and returning to
>>> python 2, my applications fail with the error reported in my first message.
>>> The error goes away if I replace the .pkl file with an old backup I had
>>> made before using python 2.
>>>
>>> I have noticed that once the .pkl file is written with python 3, then
>>> reading it with python 2 and 3 throws different results:
>>>
>>> *with python 3*:
>>> >>> r = pickle.load(open('domains_apps.pkl', 'rb'))
>>> >>> print(r)
>>> {'prod.com': 'prod', 'test.com': 'test'}
>>>
>>>
>>> *with python 2*:
>>> >>> r = pickle.load(open('domains_apps.pkl', 'rb'))
>>> >>> print(r)
>>> {*u*'prod.com': *u*'prod', *u*'test.com': *u*'test'}
>>>
>>>
>>> Notice that in python 2 reading the .pkl file (that was written with
>>> python 3 using protocol=2) returns unicode strings. This doesn't happen in
>>> python 3. But i'm not sure what protocol to use.
>>>
>>> I'll do some more tests and I'll post here whatever solution I can find.
>>> Thanks for your time!
>>> Regards,
>>> Lisandro.
>>>
>>>
>>>
>>>
>>>
>>> El jueves, 10 de octubre de 2019, 21:21:53 (UTC-3), Dave S escribió:
>>>>
>>>> Delete all the .pyc files?
>>>>
>>>>
>>>> /dps
>>>>
>>>
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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