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example: Redirect --help output to stdout/stderr

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When --help is requested, print usage() to stdout.
When an illegal option is passed, print usage to stderr.

Signed-off-by: Philipp Hahn <hahn@univention.de>
This commit is contained in:
Philipp Hahn 2011-10-12 17:11:58 +02:00 committed by Eric Blake
parent 08d56e24b0
commit 78adf5099f
1 changed files with 4 additions and 4 deletions
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8
examples/domain-events/events-python/event-test.py
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@ -469,9 +469,9 @@ def myDomainEventIOErrorCallback(conn, dom, srcpath, devalias, action, opaque):
def myDomainEventGraphicsCallback(conn, dom, phase, localAddr, remoteAddr, authScheme, subject, opaque):
print "myDomainEventGraphicsCallback: Domain %s(%s) %d %s" % (dom.name(), dom.ID(), phase, authScheme)
def usage():
print "usage: "+os.path.basename(sys.argv[0])+" [uri]"
print " uri will default to qemu:///system"
def usage(out=sys.stderr):
print >>out, "usage: "+os.path.basename(sys.argv[0])+" [uri]"
print >>out, " uri will default to qemu:///system"
def main():
try:
@ -483,7 +483,7 @@ def main():
sys.exit(2)
for o, a in opts:
if o in ("-h", "--help"):
usage()
usage(sys.stdout)
sys.exit()
if len(args) >= 1: