Added if statement to base_directory in case directory entered is path to file.

geomagio/residual/SpreadsheetAbsolutesFactory.py

@@ -304,7 +304,11 @@ class SpreadsheetAbsolutesFactory(object):
 
     def __init__(self, base_directory="/Volumes/geomag/pub/observatories"):
         # trim filename off base_directory
-        self.base_directory = base_directory
+        self.base_directory = (
+            base_directory
+            if os.path.isdir(base_directory)
+            else os.path.dirname(base_directory)
+        )
 
     def get_readings(
         self,

geomagio/residual/SpreadsheetSummaryFactory.py

@@ -40,7 +40,11 @@ class SpreadsheetSummaryFactory(object):
     """Read absolutes from summary spreadsheets"""
 
     def __init__(self, base_directory: str):
-        self.base_directory = base_directory
+        self.base_directory = (
+            base_directory
+            if os.path.isdir(base_directory)
+            else os.path.dirname(base_directory)
+        )
 
     def get_readings(
         self, observatory: str, starttime: UTCDateTime, endtime: UTCDateTime