Use Base.require in core.Julia

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 is_windows
+from .utils import IMPORT_PYCALL, is_windows
 
 try:
     from shutil import which
@@ -500,7 +500,7 @@ 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(u"using PyCall")
+        self._call(IMPORT_PYCALL)
 
         # Whether we initialized Julia or not, we MUST create at least one
         # instance of PyObject and the convert function. Since these will be

src/julia/utils.py

@@ -22,3 +22,9 @@ def _execprog_subprocess(cmd):
     execprog = _execprog_subprocess
 else:
     execprog = _execprog_os
+
+
+PYCALL_PKGID = """\
+Base.PkgId(Base.UUID("438e738f-606a-5dbb-bf0a-cddfbfd45ab0"), "PyCall")"""
+
+IMPORT_PYCALL = "const PyCall = Base.require({})".format(PYCALL_PKGID)