popen4(): Added for Unix.
Fixed a typo in a docstring.
diff --git a/Lib/os.py b/Lib/os.py
index 70af0a9..ea38021 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -317,7 +317,7 @@
def getenv(key, default=None):
"""Get an environment variable, return None if it doesn't exist.
- The optional second argument can specify an alternative default."""
+ The optional second argument can specify an alternate default."""
return environ.get(key, default)
def _exists(name):
@@ -458,14 +458,18 @@
if _exists("fork"):
if not _exists("popen2"):
def popen2(cmd, mode="t", bufsize=-1):
- assert mode[:1] in ("b", "t")
import popen2
stdout, stdin = popen2.popen2(cmd, bufsize)
return stdin, stdout
if not _exists("popen3"):
def popen3(cmd, mode="t", bufsize=-1):
- assert mode[:1] in ("b", "t")
import popen2
stdout, stdin, stderr = popen2.popen3(cmd, bufsize)
return stdin, stdout, stderr
+
+ if not _exists("popen4"):
+ def popen4(cmd, mode="t", bufsize=-1):
+ import popen2
+ stdout, stdin = popen2.popen4(cmd, bufsize)
+ return stdin, stdout