Updates:
Summary: sympify(u"α") does not work
Labels: -Priority-Medium Priority-High Milestone-Release0.7.0
Comment #1 on issue 1763 by [email protected]: sympify(u"α") does not
work
http://code.google.com/p/sympy/issues/detail?id=1763
Actually, "α" is garbage and we shouldn't do anything with it: that's a
bytestream
containing whatever value the system's encoding gives to the unicode
character alpha.
That the interpreter allows such nonsense is a Python 2.* bug. Python 3.*
is much
more sensible (recall that a Python 3.* string is Python 2.*'s unicode,
while Python
3.*'s bytes is Python 2.*'s string):
Python 3.1.1+ (r311:74480, Nov 2 2009, 14:49:22)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> "α"
'α'
>>> b"α"
File "<stdin>", line 1
SyntaxError: bytes can only contain ASCII literal characters.
For comparison:
Python 2.6.4 (r264:75706, Nov 2 2009, 14:38:03)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> "α"
'\xce\xb1'
>>> u"α"
u'\u03b1'
>>> print u"α"
α
On the other hand, u"α" is a sensible value and sympify should definitely do
something with it, but doesn't:
In [56]: sympify(u"α")
---------------------------------------------------------------------------
UnicodeEncodeError Traceback (most recent call last)
/media/sda2/Boulot/Projets/sympy-git/<ipython console> in <module>()
/media/sda2/Boulot/Projets/sympy-git/sympy/core/sympify.pyc in sympify(a,
locals,
convert_xor)
109 # and try to parse it. If it fails, then we have no
luck and
110 # return an exception
--> 111 a = str(a)
112
113 if convert_xor:
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1:
ordinal
not in range(128)
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