Merge pull request #6 from tkf/evil

A dirty hack to force importing PyDSTool

Author: ChrisRackauckas

.gitignore

@@ -1,3 +1,4 @@
 *.jl.cov
 *.jl.*.cov
 *.jl.mem
+*.pyc

src/PyDSTool.jl

@@ -7,6 +7,25 @@ using PyCall, DataStructures, DiffEqBase, RecipesBase
 const ds = PyNULL()
 
 function __init__()
+  try
+    copy!(ds, pyimport_conda("PyDSTool", "pydstool", "conda-forge"))
+    return
+  catch err
+    if err isa PyCall.PyError
+      # A dirty hack to force importing PyDSTool:
+      # https://github.com/JuliaDiffEq/PyDSTool.jl/issues/5
+      #
+      # At this point, we assume that "import PyDSTool" was failed due
+      # to the bug in how it checks SciPy version number.  We
+      # workaround it by monkey-patching `scipy.__version__` while
+      # importing PyDSTool.  We make ./_pydstool_jl_hack.py importable
+      # and execute it by importing it.
+      unshift!(PyVector(pyimport("sys")["path"]), @__DIR__)
+      pyimport("_pydstool_jl_hack")
+    else
+      rethrow()
+    end
+  end
   copy!(ds, pyimport_conda("PyDSTool", "pydstool", "conda-forge"))
 end
 

src/_pydstool_jl_hack.py

@@ -0,0 +1,34 @@
+import scipy.special
+
+# Old sph_* removed in SciPy 1.0:
+# https://docs.scipy.org/doc/scipy/reference/release.1.0.0.html#backwards-incompatible-changes
+old_special_funcs = [
+    'sph_jn',
+    'sph_yn',
+    'sph_jnyn',
+    'sph_in',
+    'sph_kn',
+    'sph_inkn',
+]
+
+
+original_version = scipy.__version__
+try:
+
+    # Fool how PyDSTool checks SciPy's version number:
+    scipy.__version__ = '0.9'
+
+    # PyDSTool tries to access `scipy.special.sph_*`; let's not fail
+    # by that by setting them to None.  Those functions won't be
+    # usable, but at least (hopefully) other PyDSTool functionalities
+    # are usable:
+    for name in old_special_funcs:
+        if not hasattr(scipy.special, name):
+            setattr(scipy.special, name, None)
+
+    import PyDSTool
+finally:
+    scipy.__version__ = original_version
+    for name in old_special_funcs:
+        if getattr(scipy.special, name) is None:
+            delattr(scipy.special, name)