#!/usr/bin/pythonimport sys, libxml2 libxml2.debugMemory(True) expect="""--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed--> Invalid expression--> xmlXPathEval: evaluation failed"""err=""def callback(ctx, str):     global err      err = err + "%s %s" % (ctx, str) libxml2.registerErrorHandler(callback, "-->") doc = libxml2.parseDoc("<fish/>")ctxt = doc.xpathNewContext()ctxt.setContextNode(doc)badexprs = (	":false()", "bad:()", "bad(:)", ":bad(:)", "bad:(:)", "bad:bad(:)",	"a:/b", "/c:/d", "//e:/f", "g://h"	)for expr in badexprs:	try:		ctxt.xpathEval(expr)	except libxml2.xpathError, e:	        pass	else:		print "Unexpectedly legal expression:", exprctxt.xpathFreeContext()doc.freeDoc() if err != expect:    print "error"    print "received %s" %(err)    print "expected %s" %(expect)    sys.exit(1) libxml2.cleanupParser()leakedbytes = libxml2.debugMemory(True)if leakedbytes == 0:	print "OK"else:	print "Memory leak", leakedbytes, "bytes"	# drop file to .memdump file in cwd, but won't work if not compiled in	libxml2.dumpMemory()