[Python] try... except

	#python
	try: #prevent unexpected crash
	ofile = open(filename)
	except:
	print "file cannot be openned:", filename
	exit()
	#read one line at a time
	for line in ofile:
	line = line.rstrip() #delete "/n" from original file line
	print line
	#read "whole" file at a time
	wholeFile = ofile.read()

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