No, because it has data types that are not objects (such as int and byte). I believe Smalltalk is truly object-oriented but I have only a little experience with that language (about two months worth some five years ago).
I've also heard claims from the Ruby crowd but I have zero experience with that language.
This is, of course, using the definition of "truly OO" meaning it only has objects and no other types. Others may not agree with this definition.
It appears, after a little research into Python (I had no idea about the name/object distinction despite having coded in it for a year or so - more fool me, I guess), that it may indeed be truly OO.
The following code works fine:
#!/usr/bin/python
i = 7
print id(i)
print type(i)
print i.__str__()
outputting:
6701648
7
so even the base integers are objects here.
