mirror of https://github.com/python/cpython
parent
d75e63a865
commit
20af3172ce
10
Lib/os.py
10
Lib/os.py
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@ -317,7 +317,7 @@ else:
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def getenv(key, default=None):
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"""Get an environment variable, return None if it doesn't exist.
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The optional second argument can specify an alternative default."""
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The optional second argument can specify an alternate default."""
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return environ.get(key, default)
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def _exists(name):
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@ -458,14 +458,18 @@ otherwise return -SIG, where SIG is the signal that killed it. """
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if _exists("fork"):
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if not _exists("popen2"):
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def popen2(cmd, mode="t", bufsize=-1):
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assert mode[:1] in ("b", "t")
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import popen2
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stdout, stdin = popen2.popen2(cmd, bufsize)
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return stdin, stdout
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if not _exists("popen3"):
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def popen3(cmd, mode="t", bufsize=-1):
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assert mode[:1] in ("b", "t")
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import popen2
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stdout, stdin, stderr = popen2.popen3(cmd, bufsize)
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return stdin, stdout, stderr
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if not _exists("popen4"):
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def popen4(cmd, mode="t", bufsize=-1):
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import popen2
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stdout, stdin = popen2.popen4(cmd, bufsize)
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return stdin, stdout
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