If $PYTHONNEWIO is set and nonempty,
io.py is used for open() and sys.std{in,out,err}.
Note that this currently breaks about 25 tests.
diff --git a/Lib/site.py b/Lib/site.py
index 95001ba..48cf385 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -400,6 +400,28 @@
(err.__class__.__name__, err))
+def installnewio():
+ """Install new I/O library as default.
+
+ This is only done if $PYTHONNEWIO is set and non-empty.
+ """
+ if not os.getenv("PYTHONNEWIO"):
+ return
+ import io
+ # Trick so that open won't become a bound method when stored
+ # as a class variable (as dumbdbm does)
+ class open:
+ def __new__(cls, *args, **kwds):
+ return io.open(*args, **kwds)
+ __builtin__.classic_open = __builtin__.open
+ __builtin__.classic_file = __builtin__.file
+ __builtin__.open = open
+ __builtin__.file = open
+ sys.stdin = io.open(0, "r")
+ sys.stdout = io.open(1, "w")
+ sys.stderr = io.open(2, "w")
+
+
def main():
abs__file__()
paths_in_sys = removeduppaths()
@@ -414,6 +436,7 @@
sethelper()
aliasmbcs()
setencoding()
+ installnewio()
execsitecustomize()
# Remove sys.setdefaultencoding() so that users cannot change the
# encoding after initialization. The test for presence is needed when