And get the bytes of that StringIO object?
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3 Answers
StringIO objects implement the file API, so you can get their size in exactly the same way as you can with a file object: seek to the end and see where it goes.
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 any file-like object.
1 Comment
ThorSummoner
I recommend storing the result of
pos = s.tell() and s.seek(pos) after checking this value, in the case that file position is important to any of your consumers.By checking the len attribute and using the getvalue() method
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'
7 Comments
TIMEX
I don't have that. Instead, I have this: ['class', 'delattr', 'doc', 'format', 'getattribute', 'hash', 'init', 'iter', 'new', 'reduce', 'reduce_ex', 'repr', 'setattr', 'sizeof', 'str', 'subclasshook', 'close', 'closed', 'flush', 'getvalue', 'isatty', 'next', 'read', 'readline', 'readlines', 'reset', 'seek', 'tell', 'truncate']
Glenn Maynard
I'm guessing you're actually using
cStringIO and not StringIO, which--for what reason I don't know--doesn't have a len property to match StringIO. I guess the len property is actually undocumented, which is also a little odd.
shezi
Also note that the
len was removed in Python3, so you cannot use your solution in Python3.
Kimvais
When on Python3, please note that
StringIO.write() returns the amount of characters written, so you can just keep track of them without the need of checking the length...
rjurney
This does not work in Python 3.5.
AttributeError: '_io.StringIO' object has no attribute 'len' |
I used the 'getvalue' method and checked the length of the return value
len(s.getvalue())
