DEBUG: Print on error

src/julia/core.py

@@ -32,7 +32,7 @@
 from .libjulia import UNBOXABLE_TYPES, LibJulia, get_inprocess_libjulia, get_libjulia
 from .options import JuliaOptions, options_docs
 from .release import __version__
-from .utils import IMPORT_PYCALL, is_windows
+from .utils import IMPORT_PYCALL, PYCALL_PKGID, is_windows
 
 try:
     from shutil import which
@@ -500,7 +500,15 @@ def __init__(self, init_julia=True, jl_init_path=None, runtime=None,
 
         # Currently, PyJulia assumes that `Main.PyCall` exsits.  Thus, we need
         # to import `PyCall` again here in case `init_julia=False` is passed:
-        self._call(IMPORT_PYCALL)
+        self._call(f"""
+        const PyCall = try
+            Base.require({PYCALL_PKGID})
+        catch err
+            @error "Failed to import PyCall" exception = (err, catch_backtrace())
+            rethrow()
+        end
+        """)
+
         self._call(u"using .PyCall")
 
         # Whether we initialized Julia or not, we MUST create at least one