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"""
Load or save values to a file.
Shelves work well for storing data, but they are slow to access
repeatedly - especially for large data sets. This module allows
you to store data to a file and then load it back into the workspace.
When the data is stored, a python module is also created as the
"namespace for the data"
Examples
--------
Saving the data to a data store:
>>> import scipy.io
>>> import os
>>> a = 1
>>> scipy.io.save_as_module('junker', {'a':a})
Loading the data saved to a data store in the same directory:
>>> import junker
>>> print junker.a
1
"""
__all__ = ['save_as_module']
import dumb_shelve
import os
def _create_module(file_name):
""" Create the module file.
"""
if not os.path.exists(file_name+'.py'): # don't clobber existing files
module_name = os.path.split(file_name)[-1]
f = open(file_name+'.py','w')
f.write('import scipy.io.data_store as data_store\n')
f.write('import %s\n' % module_name)
f.write('data_store._load(%s)' % module_name)
f.close()
def _create_shelf(file_name,data):
"""Use this to write the data to a new file
"""
shelf_name = file_name.split('.')[0]
f = dumb_shelve.open(shelf_name,'w')
for i in data.keys():
# print 'saving...',i
f[i] = data[i]
# print 'done'
f.close()
def save_as_module(file_name=None,data=None):
"""
Save the dictionary "data" into a module and shelf named save.
Parameters
----------
file_name : str, optional
File name of the module to save.
data : dict, optional
The dictionary to store in the module.
"""
_create_module(file_name)
_create_shelf(file_name,data)
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