一些代码:
import cStringIO
def f():
buffer = cStringIO.StringIO()
buffer.write('something')
return buffer.getvalue()
文档说:
StringIO.close()
: 释放内存缓冲区。尝试对已关闭的 StringIO 对象执行进一步操作将引发 ValueError。
我是否必须这样做buffer.close()
,或者当缓冲区超出范围并被垃圾收集时它会自动发生?
更新:
我做了一个测试:
import StringIO, weakref
def handler(ref):
print 'Buffer died!'
def f():
buffer = StringIO.StringIO()
ref = weakref.ref(buffer, handler)
buffer.write('something')
return buffer.getvalue()
print 'before f()'
f()
print 'after f()'
结果:
vic@wic:~/projects$ python test.py
before f()
Buffer died!
after f()
vic@wic:~/projects$