Chris Stiles <ch***@example.org> wrote previously:
|Is there a human readable dump format for objects ? As opposed to
|pickling ? It doesn't necessarily have to be XML - in fact i'd prefer
|if it wasn't ;) - but ISTR an XML dump library.
Another poster pointed to YAML, which is a good format. If you want
XML, however, I have gnosis.xml.pickle in Gnosis Utilities.
Some comparisons:
import gnosis.xml.pickle
import yaml
class Something:
... def __init__(self):
... self.tup = (1,2,3)
... self.dct = {1.4:5.6,7.8:9.0}
... self.str = "Spam and eggs"
... o = Something()
print gnosis.xml.pickle.dumps(o)
<?xml version="1.0"?>
<!DOCTYPE PyObject SYSTEM "PyObjects.dtd">
<PyObject module="__main__" class="Something" id="2283692">
<attr name="tup" type="tuple" id="2577828" >
<item type="numeric" value="1" />
<item type="numeric" value="2" />
<item type="numeric" value="3" />
</attr>
<attr name="dct" type="dict" id="2829140" >
<entry>
<key type="numeric" value="1.3999999999999999" />
<val type="numeric" value="5.5999999999999996" />
</entry>
<entry>
<key type="numeric" value="7.7999999999999998" />
<val type="numeric" value="9." />
</entry>
</attr>
<attr name="str" type="string" value="Spam and eggs" />
</PyObject> print yaml.dump(o)
--- !!__main__.Something
dct:
1.4: 5.6
7.8: 9.0
str: Spam and eggs
tup:
- 1
- 2
- 3
Certainly YAML is a lot less verbose (but also in a way less explicit).
The method 'yaml.dump()' is misnamed, however, it should have an 's' at
the end.
However, notice this:
class NewSomething(object):
... def __init__(self):
... self.tup = (1,2,3)
... self.dct = {1.4:5.6,7.8:9.0}
... self.str = "Spam and eggs"
... o2 = NewSomething()
print yaml.dump(o2)
--- <__main__.NewSomething object at 0x2abbcc>
Gnosis does fine here:
print gnosis.xml.pickle.dumps(o2)
<?xml version="1.0"?>
<!DOCTYPE PyObject SYSTEM "PyObjects.dtd">
<PyObject module="__main__" class="NewSomething" id="2800588">
<attr name="tup" type="tuple" id="2576628" >
<item type="numeric" value="1" />
<item type="numeric" value="2" />
<item type="numeric" value="3" />
</attr>
<attr name="dct" type="dict" id="2829820" >
<entry>
<key type="numeric" value="1.3999999999999999" />
<val type="numeric" value="5.5999999999999996" />
</entry>
<entry>
<key type="numeric" value="7.7999999999999998" />
<val type="numeric" value="9." />
</entry>
</attr>
<attr name="str" type="string" value="Spam and eggs" />
</PyObject>
Moreover, notice this:
class ListandTuple:
... def __init__(self):
... self.tup = (1,2,3)
... self.lst = [1,2,3]
... lt = ListandTuple()
print yaml.dump(lt)
--- !!__main__.ListandTuple
lst:
- 1
- 2
- 3
tup:
- 1
- 2
- 3
YAML is lossy in regard to Python types. Some other languages supported
by the YAML format do not have the list/tuple distinction, but since
Python does, usually you want to keep it (which gnosis.xml.pickle does).
Yours, David...
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