Coverage for local/lib/python2.7/site-packages/sage/misc/persist.py : 0%

r""" 

Object persistence 

You can load and save most Sage object to disk using the load and 

save member functions and commands. 

.. note:: 

It is impossible to save certain Sage objects to disk. For example, 

if `x` is a MAGMA object, i.e., a wrapper around an object 

that is defined in MAGMA, there is no way to save `x` it to 

disk, since MAGMA doesn't support saving of individual objects to 

disk. 

- Versions: Loading and saving of objects is guaranteed to work 

even if the version of Python changes. Saved objects can be loaded 

in future versions of Python. However, if the data structure that 

defines the object, e.g., in Sage code, changes drastically (or 

changes name or disappears), then the object might not load 

correctly or work correctly. 

- Objects are zlib compressed for space efficiency. 

""" 

from __future__ import absolute_import 

from sage.structure.sage_object import save, load, \ 

loads, dumps, SageObject 

from .misc import SAGE_DB 

def load_sage_object(cls, dic): # not used 

X = cls.__new__(cls) 

try: 

X.__setstate__(dic) 

except AttributeError: 

X.__dict__ = dic 

return X 

from six.moves import cPickle 

def load_sage_element(cls, parent, dic_pic): 

X = cls.__new__(cls) 

X._set_parent(parent) 

X.__dict__ = cPickle.loads(dic_pic) 

return X 

def db(name): 

r""" 

Load object with given name from the Sage database. Use x.db(name) 

or db_save(x, name) to save objects to the database. 

The database directory is ``$HOME/.sage/db``. 

""" 

return load('%s/%s'%(SAGE_DB,name)) 

def db_save(x, name=None): 

r""" 

Save x to the Sage database. 

The database directory is ``$HOME/.sage/db``. 

""" 

try: 

x.db(name) 

except AttributeError: 

save(x, '%s/%s'%(SAGE_DB,name))