Review Request 122458: Fix variables persistence in backends to Python 2 and 3

[Filipe Saraiva]

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https://git.reviewboard.kde.org/r/122458/
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Review request for KDE Edu, Alexander Rieder, Lucas Hermann Negri, and Minh Ngo.


Repository: cantor


Description
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Fix the script to save variables of Python 2 and Python 3 environment correctly. Previous version of the function did not work in Python 3 (because there is not _unicode_ function in Python 3).

I would like to request the review because I don't have idea about the impact of change _unicode_ function to _str_ function in Python 2.


Diffs
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  src/backends/python/variables_saver.py e90c496 

Diff: https://git.reviewboard.kde.org/r/122458/diff/


Testing
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In both Pythn 2 and Python 3 backends:

* Save different types of variables (float, int, string, numpy.array) to a file;
* Load this file to Cantor.


Thanks,

Filipe Saraiva

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