在 Python 中，如何检查 StringIO 对象的大小？
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In Python, how do I check the size of a StringIO object?
提问by TIMEX
And get the bytes of that StringIO object?
并获取该 StringIO 对象的字节？
采纳答案by Glenn Maynard
StringIOobjects implement the file API, so you can get their size in exactly the same way as you can with a fileobject: seek to the end and see where it goes.
StringIO对象实现了文件 API，因此您可以以与使用file对象完全相同的方式获取它们的大小：寻找到最后并查看它的去向。
from StringIO import StringIO
import os
s = StringIO()
s.write("abc")
pos = s.tell()
s.seek(0, os.SEEK_END)
print s.tell()
s.seek(pos)
As Kimvais mentions, you can also use the len, but note that that's specific to StringIO objects. In general, a major reason to use these objects in the first place is to use them with code that expects a file-like object. When you're dealing with a generic file-like object, you generally want to do the above to get its length, since that works with anyfile-like object.
正如 Kimvais 所提到的，您也可以使用len，但请注意，这是特定于 StringIO 对象的。通常，首先使用这些对象的一个主要原因是将它们与需要类文件对象的代码一起使用。当您处理一个通用的类文件对象时，您通常希望执行上述操作以获取其长度，因为这适用于任何类文件对象。
回答by Kimvais
By checking the lenattribute and using the getvalue()method
通过检查len属性并使用getvalue()方法
Type "help", "copyright", "credits" or "license" for more information.
>>> import StringIO
>>> s = StringIO.StringIO()
>>> s.write("foobar")
>>> s.len
6
>>> s.write(" and spameggs")
>>> s.len
19
>>> s.getvalue()
'foobar and spameggs'
