使用Python'with'语句时捕获异常

from __future__ import with_statementtry:    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()