[Head First Python]3. 文件与异常:处理错误

Man: Is this the right room for an argument?
Other Man: I've told you once.
Man: No you haven't
Other Man:Yes I have
Man: When? and :
(pause)
Other Man: Just now.
Man: No you didn't!

try:
data = open ("datafile.txt")

for each_line in data:
try:
(role, line_spoken) = each_line.split(":", 1)
print(role, end = '')
print(" said :", end = '')
print(line_spoken, end = '')
except ValueError:
pass

data.close()
except IOError:
print('this data file is missing!')