from __future__ import with_statement
try:
with open( "a.txt" ) as f :
print f.readlines()
except EnvironmentError: # parent of IOError, OSError *and* WindowsError where available
print 'oops'
如果您希望通过打开调用与工作代码进行不同的错误处理，则可以执行以下操作：
try:
f = open('foo.txt')
except IOError:
print('error')
else:
with f:
print f.readlines()
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