Reading the tutorial http://scipy.org/Cookbook/Theoretical_Ecology/Hastings_and_Powell I've tried to run the provided code. But compiling the fortran module with the line command given in the tuto, I've got the following traceback (you can see it with syntax highlighting at http://paste.debian.net/48759 ): fab@Portable-s2m:/tmp$ f2py -c -m hastings hastings.f90 running build running config_cc unifing config_cc, config, build_clib, build_ext, build commands --compiler options running config_fc unifing config_fc, config, build_clib, build_ext, build commands --fcompiler options running build_src building extension "hastings" sources f2py options: [] f2py:> /tmp/tmptfNK80/src.linux-i686-2.4/hastingsmodule.c creating /tmp/tmptfNK80 creating /tmp/tmptfNK80/src.linux-i686-2.4 Reading fortran codes... Reading file 'hastings.f90' (format:free) Post-processing... Block: hastings Block: model Block: fweb Post-processing (stage 2)... Block: hastings Block: unknown_interface Block: model Block: fweb Building modules... Building module "hastings"... Constructing F90 module support for "model"... Variables: a1 a2 b1 b2 d2 d1 Constructing wrapper function "model.fweb"... yprime = fweb(y,t) Wrote C/API module "hastings" to file "/tmp/tmptfNK80/src.linux-i686-2.4/hastingsmodule.c" Traceback (most recent call last): File "/usr/bin/f2py", line 26, in ? main() File "/var/lib/python-support/python2.4/numpy/f2py/f2py2e.py", line 558, in main run_compile() File "/var/lib/python-support/python2.4/numpy/f2py/f2py2e.py", line 545, in run_compile setup(ext_modules = [ext]) File "/var/lib/python-support/python2.4/numpy/distutils/core.py", line 176, in setup return old_setup(**new_attr) File "/usr/lib/python2.4/distutils/core.py", line 149, in setup dist.run_commands() File "/usr/lib/python2.4/distutils/dist.py", line 946, in run_commands self.run_command(cmd) File "/usr/lib/python2.4/distutils/dist.py", line 966, in run_command cmd_obj.run() File "/usr/lib/python2.4/distutils/command/build.py", line 113, in run self.run_command(cmd_name) File "/usr/lib/python2.4/distutils/cmd.py", line 333, in run_command self.distribution.run_command(command) File "/usr/lib/python2.4/distutils/dist.py", line 966, in run_command cmd_obj.run() File "/var/lib/python-support/python2.4/numpy/distutils/command/build_src.py", line 130, in run self.build_sources() File "/var/lib/python-support/python2.4/numpy/distutils/command/build_src.py", line 147, in build_sources self.build_extension_sources(ext) File "/var/lib/python-support/python2.4/numpy/distutils/command/build_src.py", line 256, in build_extension_sources sources = self.f2py_sources(sources, ext) File "/var/lib/python-support/python2.4/numpy/distutils/command/build_src.py", line 511, in f2py_sources numpy.f2py.run_main(f2py_options + ['--lower', File "/var/lib/python-support/python2.4/numpy/f2py/f2py2e.py", line 367, in run_main ret=buildmodules(postlist) File "/var/lib/python-support/python2.4/numpy/f2py/f2py2e.py", line 319, in buildmodules dict_append(ret[mnames[i]],rules.buildmodule(modules[i],um)) File "/var/lib/python-support/python2.4/numpy/f2py/rules.py", line 1222, in buildmodule for l in '\n\n'.join(funcwrappers2)+'\n'.split('\n'): TypeError: cannot concatenate 'str' and 'list' objects