working with sympy about pycall.jl HOT 8 CLOSED

It looks like the problem is that some of the identifiers in the sympy module are Julia reserved words (e.g. sympy.function), so that pywrap has a problem when it tries to declare a datatype with members of those names. I hacked pywrap to add "__" to the end of all of the identifiers, and the problem goes away.

I'm not sure which of the identifiers in particular causes the problem yet, or why it gives this strange error message. The general solution would be for pywrap to add underscores or something (?) to symbols that are reserved words in Julia.

from pycall.jl.

Thanks, but I also need to add these to your reserved words to get it to work out for me:

const reserved_from_base = Set("Dict", "Matrix", "Range", "Rational", "Set", "acos", "acosh", "acot", "acoth", "add", "asin", "asinh", "atan", "atan2", "atanh", "besseli", "besselj", "besselk", "bessely", "beta", "binomial", "collect", "cos", "cosh", "cot", "coth", "csc", "dense", "diag", "diff", "digamma", "div", "erf", "exp", "expand", "expr", "eye", "factor", "factorial", "floor", "gamma", "gcd", "im", "isprime", "lcm", "log", "mod", "nan", "ones", "pi", "prod", "rem", "reshape", "sec", "sign", "sin", "sinh", "solve", "sparse", "sqrt", "symbol", "take", "tan", "tanh", "transpose", "trunc", "var", "zeros", "zeta")

These came from intersecting the member names of the pyimport("sympy") object with the names in Base.

from pycall.jl.

Hmm, on my machine sympy.acot imported just fine. acot is not a reserved word in Julia, so it is safe to use it as the name of a member.

On my machine, there is no sympy.Dict; maybe I'm using a version that is too old? If sympy.Dict translates to something of type Dict, that could cause a problem because of Julia issue #2919. Similarly for sympy.Set and any other member that corresponds to a typename in Base. This seems like a bug in Julia (typenames are not reserved words, and it is possible to use them as member names), but if it takes too long to get fixed I might add them to reserved as a workaround.

from pycall.jl.

Thanks for looking into this.

I have the following:

o = pyimport("sympy")
members = convert(Vector{(String,PyObject)},
pycall(PyCall.inspect["getmembers"], PyObject,
o))

members[200] ## ("version",PyObject '0.7.2-git')
members[25] ## ("Dict",PyObject <class 'sympy.core.containers.Dict'>)
members[164] ## ("Set",PyObject <class 'sympy.core.sets.Set'>)

0.7.2 is the latest released version from
https://code.google.com/p/sympy/downloads/list

I can do a workaround in my initialization code for my SymPy package. It
will get much less use than yours. All I need to do is modify pywrap and
sympy seems to work fine and remove that when things settle out.

On Tue, Apr 23, 2013 at 1:20 PM, Steven G. Johnson <[email protected]

wrote:

Hmm, on my machine sympy.acot imported just fine. acot is not a reserved
word in Julia, so it is safe to use it as the name of a member.

On my machine, there is no sympy.Dict; maybe I'm using a version that is
too old? If sympy.Dict translates to something of type Dict, that could
cause a problem because of Julia issue #2919. Similarly for sympy.Set and
any other member that corresponds to a typename in Base. This seems like a
bug in Julia (typenames are not reserved words, and it is possible to use
them as member names), but if it takes too long to get fixed I might add
them to reserved as a workaround.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-16883743
.

John Verzani
Chair, Department of Mathematics
College of Staten Island, CUNY
[email protected]

from pycall.jl.

If you just include the typenames (Dict, Matrix, etcetera) in the reserved words, but not the functions (acos, etc.), does it work?

from pycall.jl.

This combination worked (just adding ,"Dict", "Matrix", "Range",
"Rational", "Set" as suggested).

const reserved = Set("while", "if", "for", "try", "return", "break",
"continue", "function", "macro", "quote", "let",
"local",
"global", "const", "abstract", "typealias", "type",
"bitstype", "immutable", "ccall", "do", "module",
"baremodule", "using", "import", "export", "importall",
"Function"
,"Dict", "Matrix", "Range", "Rational", "Set"
)

On Tue, Apr 23, 2013 at 7:27 PM, Steven G. Johnson <[email protected]

wrote:

If you just include the typenames (Dict, Matrix, etcetera) in the reserved
words, but not the functions (acos, etc.), does it work?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-16904893
.

John Verzani
Chair, Department of Mathematics
College of Staten Island, CUNY
[email protected]

from pycall.jl.

I'm guessing you only need Dict and Matrix, since the other three types aren't converted into types of the same name (yet).

from pycall.jl.

In fact, it looks like just adding Dict works. Thanks again!

On Wed, Apr 24, 2013 at 7:02 AM, Steven G. Johnson <[email protected]

wrote:

I'm guessing you only need Dict and Matrix, since the other three types
aren't converted into types of the same name (yet).

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/18#issuecomment-16931285
.

John Verzani
Chair, Department of Mathematics
College of Staten Island, CUNY
[email protected]

from pycall.jl.