enable export to and from json for MS

pyleoclim/core/multipleseries.py

@@ -4,7 +4,7 @@
 to such a collection at once (e.g. process a bunch of series in a consistent fashion).
 """
 
-from ..utils import tsutils, plotting
+from ..utils import tsutils, plotting, jsonutils
 from ..utils import correlation as corrutils
 
 from ..core.correns import CorrEns
@@ -2288,3 +2288,47 @@ def to_pandas(self, paleo_style=False, *args, use_common_time=False, **kwargs):
             tl = ms.series_list[0].time_name
             df.index.name = tl if tl is not None else 'time' 
         return df
+
+
+    def to_json(self, path=None):
+        '''
+        Export the pyleoclim.MultipleSeries object to a json file
+
+        Parameters
+        ----------
+        path : string, optional
+            The path to the file. The default is None, resulting in a file saved in the current working directory using the label for the dataset as filename if available or 'mulitpleseries.json' if label is not provided.
+
+        Returns
+        -------
+        None.
+
+        '''
+
+        if path is None:        
+            path = self.series_list[0].label.replace(" ", "_") + '.json' if self.series_list[0].label is not None else 'multipleseries.json' 
+
+        jsonutils.PyleoObj_to_json(self, path)
+
+    @classmethod    
+    def from_json(cls, path):
+        ''' Creates a pyleoclim.MulitpleSeries from a JSON file
+
+        The keys in the JSON file must correspond to the parameter associated with MulitpleSeries and Series objects
+
+        Parameters
+        ----------
+        path : str
+            Path to the JSON file
+
+        Returns
+        -------
+        ts : pyleoclim.core.series.MulitplesSeries
+            A Pyleoclim MultipleSeries object. 
+
+        '''
+
+        a = jsonutils.open_json(path)
+        b = jsonutils.iterate_through_dict(a, 'MultipleSeries')
+
+        return cls(**b)

pyleoclim/utils/jsonutils.py

@@ -282,6 +282,11 @@ def iterate_through_dict(dictionary, objname):
                     item['timeseries'] = pyleo.Series(**item['timeseries'])
                 a[k]['scalogram_list'][idx]=pyleo.Scalogram(**a[k]['scalogram_list'][idx])
             a[k] = pyleo.MultipleScalogram(**a[k]) 
+
+    #Deal with MultipleSeries
+    if objname == 'MultipleSeries':
+        for idx,item in enumerate(a['series_list']):
+            a['series_list'][idx]=pyleo.Series(**item)
 
     return a