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-rw-r--r--numpy/distutils/command/config_compiler.py9
-rw-r--r--numpy/distutils/core.py4
2 files changed, 9 insertions, 4 deletions
diff --git a/numpy/distutils/command/config_compiler.py b/numpy/distutils/command/config_compiler.py
index 5e638fecc..bf170063e 100644
--- a/numpy/distutils/command/config_compiler.py
+++ b/numpy/distutils/command/config_compiler.py
@@ -5,9 +5,12 @@ from numpy.distutils import log
#XXX: Linker flags
-def show_fortran_compilers(_cache=[]):
- # Using cache to prevent infinite recursion
- if _cache: return
+def show_fortran_compilers(_cache=None):
+ # Using cache to prevent infinite recursion.
+ if _cache:
+ return
+ elif _cache is None:
+ _cache = []
_cache.append(1)
from numpy.distutils.fcompiler import show_fcompilers
import distutils.core
diff --git a/numpy/distutils/core.py b/numpy/distutils/core.py
index d9e125368..70cc37caa 100644
--- a/numpy/distutils/core.py
+++ b/numpy/distutils/core.py
@@ -71,12 +71,14 @@ def _dict_append(d, **kws):
else:
raise TypeError(repr(type(dv)))
-def _command_line_ok(_cache=[]):
+def _command_line_ok(_cache=None):
""" Return True if command line does not contain any
help or display requests.
"""
if _cache:
return _cache[0]
+ elif _cache is None:
+ _cache = []
ok = True
display_opts = ['--'+n for n in Distribution.display_option_names]
for o in Distribution.display_options: