[PyQt] Unhelpful error message i.o. "object has no attribute" in case of non-ASCII method names

[Shriramana Sharma]

Hello. I'm using PyQt 5.5.1+dfsg-3ubuntu4 with Py 3.5.1-3 default on
Kubuntu Xenial 32 bit. I'm using non-ASCII words for user-defined
variables. Actually it's in an Indic script but for readers'
convenience as minimal example I give the attached code with French.

As expected upon execution it gives the error:

Traceback (most recent call last):
  File "./ascii_test_pyqt_2.py", line 22, in <module>
    UneFenêtre()
  File "./ascii_test_pyqt_2.py", line 8, in __init__
    self.méthode()
  File "./ascii_test_pyqt_2.py", line 11, in méthode
    print(self.nom_de_fenêtre)
AttributeError: 'UneFenêtre' object has no attribute 'nom_de_fenêtre'

Then I move the self.méthode() call on line 8 to after the next line
and the error is fixed. Then I expect to get a similar error to the
above with the UneAutreFenêtre class which only differs by inheriting
from QWidget and calling its __init__(). But the error I get is:

Traceback (most recent call last):
  File "./ascii_test_pyqt_2.py", line 23, in <module>
    UneAutreFenêtre()
  File "./ascii_test_pyqt_2.py", line 16, in __init__
    self.méthode()
  File "./ascii_test_pyqt_2.py", line 19, in méthode
    print(self.nom_de_fenêtre)
UnicodeEncodeError: 'ascii' codec can't encode character '\xea' in
position 10: ordinal not in range(128)

The unhelpful message wasn't really helpful to debug the code because
I couldn't understand what ASCII codec was being called for. Is it
possible for a better error message just like the default Python one
to be printed?

Thanks.

-- 
Shriramana Sharma ஶ்ரீரமணஶர்மா श्रीरमणशर्मा 𑀰𑁆𑀭𑀻𑀭𑀫𑀡𑀰𑀭𑁆𑀫𑀸
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