为什么if后的代码块print一个中文会报错
score = 50
if score >= 60:
print '合格'
else:
print 'END'
#错误信息
File "index.py", line 3
SyntaxError: Non-ASCII character '\xe5' in file index.py on line 3, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
