ocean-city testcase is invalid: it uses subprocess.call() which 
returns the exit code, not the Python error line number! Here is a 
better testcase using subprocess.Popen() checking the line number but 
also the display line. It tests ASCII, UTF-8 and GBK charsets. Using 
GBK charset, you get the bug described by ocean-city (problem with 
multibyte charset). My testcase takes also care of script with # 
coding at the second line.