fileOpened = False
while (fileOpened == False):
     inputFilename = raw_input ("Enter the name of the input file to read from: ")
     try:
          # If file opened OK then the entire body of the try block executes
          inputFile = open (inputFilename, "r")
          fileOpened = True
     except IOError:
          # If the file could not be opened (e.g., no file with this name at that location)
          # then the body of the catch executes
          print "Could not open file", inputFilename

for line in inputFile:
    print line,

inputFile.close()