[Python-checkins] python/dist/src/Lib getopt.py,1.21,1.22

2002年7月28日 17:57:47 -0400

> >> Use os.environ.get() in stead of os.getenv() (which is 
> >> platform-dependent).
> >
> > Really? That wasn't intended! What are the differences?
>> The manual states that os.getenv() exists on Posix and Windows. 
> For os.environ no such statement is made. And indeed the mac 
> module has os.environ (even though the contents are rather 
> boring) and no os.getenv().

Hm. That sounds like a bug. There's code in os.py like this:
try:
 putenv
except NameError:
 pass
else:
 ...Here os.environ is redefined so changes are propagated...
 def getenv(key, default=None):
 return environ.get(key, default)
 __all__.append("getenv")
If this doesn't define getenv for you, it must mean you don't have
putenv?
It looks like the definition of getenv (which could be simplified to
"getenv = environ.get" BTW) ought to be outside the try/except/else
block.
--Guido van Rossum (home page: http://www.python.org/~guido/)