avoid mutable default arguments (original patch by Rémy Léone)

1 files changed, 3 insertions, 1 deletions

diff --git a/pyximport/pyximport.py b/pyximport/pyximport.py
index 7df37a2ef..5e0927260 100644
--- a/pyximport/pyximport.py
+++ b/pyximport/pyximport.py
@@ -471,7 +471,7 @@ def _have_importers():
 
 
 def install(pyximport=True, pyimport=False, build_dir=None, build_in_temp=True,
-            setup_args={}, reload_support=False,
+            setup_args=None, reload_support=False,
             load_py_module_on_import_failure=False, inplace=False,
             language_level=None):
     """Main entry point. Call this to install the .pyx import hook in
@@ -518,6 +518,8 @@ def install(pyximport=True, pyimport=False, build_dir=None, build_in_temp=True,
     The default is to use the language level of the current Python
     runtime for .py files and Py2 for .pyx files.
     """
+    if setup_args is None:
+        setup_args = {}
     if not build_dir:
         build_dir = os.path.join(os.path.expanduser('~'), '.pyxbld')