Updates:
Status: Started
Comment #3 on issue 1219 by ondrej.certik: .coeff() fails for -x/8 + x*y
http://code.google.com/p/sympy/issues/detail?id=1219
After fixing the issue 1220, it will behave like this:
In [1]: p = -x/8 + x*y
In [2]: p.coeff(x)
Out[2]: -1/8 + y
In [3]: p.coeff(-x)
Out[3]: -y
In [4]: p.coeff(y)
Out[4]: x
And after fixing the issue 1221, it should behave like this:
In [1]: p = -x/8 + x*y
In [2]: p.coeff(x)
Out[2]: -1/8 + y
In [3]: p.coeff(-x)
Out[3]: -y+1/8
In [4]: p.coeff(y)
Out[4]: x
A simple workaround for the issue 1220 is:
$ git diff
diff --git a/sympy/core/basic.py b/sympy/core/basic.py
index d13eee5..0f31309 100644
--- a/sympy/core/basic.py
+++ b/sympy/core/basic.py
@@ -1525,7 +1525,7 @@ class Basic(AssumeMeths):
return
expr = collect(self, x)
symbols = list(x.atoms(Symbol))
- w = Wild("coeff", exclude=symbols)
+ w = Wild("w", exclude=symbols)
m = expr.match(w*x+Wild("rest"))
if m:
return m[w]
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