Updates:
Cc: ondrej.certik
Labels: NeedsReview
Comment #5 on issue 282 by smichr: symbols becoming functions
http://code.google.com/p/sympy/issues/detail?id=282
In the sense that the symbol has not been declared to be a function,
something that
can accept an argument, False (I think) is the right response. f can be a
Symbol or
it can be a Function in sympy. Right now, sympy allows a call to a Symbol
and it just
recreates that symbol as a Function. This patch (below) raises an error
instead. This
will also help to alert someone that a problem has occured with "from
sympy.abc
import *" is issued (not a great idea) since this wipes out S(), N(), and
other
single letter functions. After such an import, N(3+1) will now fail rather
than
silently start treating N like a function.
Changes for review are in smichr's 282 branch at github.
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