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I would like to have a python back-end with ruby front-end. For that reason i'm using rubypython.

My question is: can I use sage with rubypython lib?

The example that did not work for me:
s.sage:

#!/usr/bin/env sage

a = 100020003000400050006000700080009000L

print "a = {0}".format(a)

sage s.sage # => s.py

r.rb:

require 'rubypython'

RubyPython.start

sys = RubyPython.import("sys")
sys.path.append("/Users/name/Documents") # path to s.py folder to import it
sys.path.append("#{ENV["SAGE_ROOT"]}")   # added in hope for the best

# added path to sage, otherwise => ImportError: No module named sage.all_cmdline
sys.path.append("/Applications/sage/devel/sage/build/lib.macosx-10.8-x86_64-2.7")

RubyPython.import 's'

Running the script:

ruby r.rb # =>
RubyPython::PythonError: ImportError: dlopen(/Applications/sage/devel/sage/build/lib.macosx-10.8-x86_64-2.7/sage/ext/c_lib.so, 2): Library not loaded: libcsage.dylib
  Referenced from: /Applications/sage/devel/sage/build/lib.macosx-10.8-x86_64-2.7/sage/ext/c_lib.so
  Reason: image not found
  import at /Users/name/.rvm/gems/jruby-1.7.6/gems/rubypython-0.6.3/lib/rubypython.rb:107
  (root) at iruby.rb:18

Works here:

/tmp/tmpf6hj9C» cat b.sage
#!/usr/bin/env sage
from sage.all_cmdline import *
xy = 2;
print xy


/tmp/tmpf6hj9C» cat a.sage
#!/usr/bin/env sage
import b
from sage.all_cmdline import *
xx = 2;
print xx, b.xy


/tmp/tmpf6hj9C» ./a.sage
2
2 2

After adding `from sage.all_cmdline import * ` to a.sage, in my case, everything start working. Nevertheless your examples do work for me even without `from sage.all_cmdline import *`

Any clues on why I'm getting this exception? Some places to look at?

script1.sage:

#!/usr/bin/env sage
import script2

script2.sage:

#!/usr/bin/env sage
smth

After I've done:

sage script2.sage # script2.py was generated
sage script1.sage # script1.py generated that uses script2.py

Both script1 and script2 do have:

from sage.all_cmdline import *

Everything works good if I:

/usr/bin/env sage script1.sage # or
sage script1.sage

But when trying to run script1.sage in this way:

./script1.sage
# =>
# Traceback (most recent call last):
# File "./script1.sage", line 4, in <module>
#   import script2
# File "path/script2.py", line 2, in <module>
#   from sage.all_cmdline import *   # import sage library
# ImportError: No module named sage.all_cmdline

Why?