Python try/except/finally应用

1.通过if和else处理异常

import os
if os.path.exists('sketch.txt'):
data = open ('sketch.txt') for each_line in data:
if not each_line.find(':') == -1:
(role, line_spoken) = each_line.split(':',1)
print (role, end ='')
print (' said ',end = '')
print (line_spoken, end ='')
data.close()
else:
print("The datafile is missing")

2.通过try/except处理异常

try:
data = open('sketch.txt') for each_line in data:
try:
(role,line_spoken) = each_line.split(':',1)
print(role,end=' ')
print('saiding=>',end='')
print(line_spoken,end='')
except ValueError:
pass
data.close()
except IOError:
print('The datafile is missing2!')

2.通过try/except/finally处理异常

try:
man_file = open('man_data.txt','w')
other_file = open('other_data.txt','w') print('hello man', file=man_file)
print('hello other', file=other_file)
except IOError:
print('File error.')
finally:
man_file.close()
other_file.close()
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