fix #804 : removed trailing NaNs and None values when extracting Axis and Group objects from __axes__ and __groups__ special sheets/csv files

Author: alixdamman

doc/source/changes/version_0_32.rst.inc

@@ -57,3 +57,6 @@ Fixes
 
 * fixed reading/exporting sessions containing two or more axes/groups
   with the same name (or anonymous) from/to CSV, Excel and HDF files (closes :issue:`803`).
+
+* fixed NaNs and None labels appearing in axes and groups when reading/exporting sessions
+  from/to CSV and Excel files (closes :issue:`804`).

larray/inout/pandas.py

@@ -346,6 +346,7 @@ def _axis_to_series(key, axis, dtype=None):
 
 def _series_to_axis(series):
     name = str(series.name)
+    series = series.loc[:series.last_valid_index()]
     if ':' in name:
         key, axis_name = name.split(':')
         labels = int(series.values[0]) if '*' in axis_name else series.values
@@ -371,6 +372,7 @@ def _series_to_group(series, axes):
     if group_name == 'None':
         group_name = None
     axis = axes[axis_name]
+    series = series.loc[:series.last_valid_index()]
     return key, LGroup(key=series.values, name=group_name, axis=axis)