#6245: make a custom infix operator decorator
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Reporter: jason | Owner: cwitty
Type: enhancement | Status:
needs_review
Priority: major | Milestone: sage-4.4
Component: misc | Keywords:
Author: Jason Grout, Carl Witty, Florent Hivert | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by rossk):
Noticed references to {{{__rmul__}}} in the code so I thought I might try
setting up a situation[[BR]]
where {{{__mul__}}} fails so {{{__rmul__}}} would be exercised. In setting
up the test code, I got an[[BR]]
error but cant see whats wrong (any thoughts?)
{{{
class Fraction:
def __init__(self, numerator, denominator=1):
self.numerator = numerator
self.denominator = denominator
def __str__(self):
return "%d/%d" % (self.numerator, self.denominator)
def zmul(self, other):
return Fraction(self.numerator*other.numerator,
self.denominator*other.denominator)
def zrmul(self, other):
return Fraction(other*self.numerator,
self.denominator)
def __mul__(self, other):
return Fraction(self.numerator*other.numerator,
self.denominator*other.denominator)
def __rmul__(self, other):
return Fraction(other*self.numerator,self.denominator)
# multiplication operator using methods
print Fraction(2,3).zmul(Fraction(5,4))
}}}
10/12
{{{
# multiplication infix operator
def dot(a,b):
return a.zmul(b)
dot = infix_operator('multiply')(dot)
print Fraction(2,3) *dot* Fraction(5,4)
}}}
crashes with
{{{
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_59.py", line 9, in <module>
open("___code___.py","w").write("# -*- coding: utf-8 -*-\n" +
_support_.preparse_worksheet_cell(base64.b64decode("Z...<abbreviated>...Y="),globals())+"\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpIR_EGe/___code___.py", line 8, in <module>
u *dot* v
File "", line 1, in <module>
File "", line 13, in __mul__
AttributeError: dot instance has no attribute 'numerator'
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6245#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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