[EDFTomoScan] move get_pixel_size to private. User should use pixel_size instead

tomoscan/esrf/edfscan.py

@@ -116,7 +116,7 @@ class EDFTomoScan(TomoScanBase):
         :rtype: float
         """
         if self.__pixel_size is None:
-            self.__pixel_size = EDFTomoScan.get_pixel_size(scan=self.path)
+            self.__pixel_size = EDFTomoScan._get_pixel_size(scan=self.path)
         return self.__pixel_size
 
     @property
@@ -391,7 +391,7 @@ class EDFTomoScan(TomoScanBase):
         return d1, d2
 
     @staticmethod
-    def get_pixel_size(scan: str) -> Union[None, int]:
+    def _get_pixel_size(scan: str) -> Union[None, int]:
         if os.path.isdir(scan) is False:
             return None
         value = EDFTomoScan.retrieve_information(scan=scan,
@@ -411,7 +411,7 @@ class EDFTomoScan(TomoScanBase):
         # for now pixel size are stored in microns.
         # We want to return them in meter
         if value is not None:
-            return value * metricsystem.micrometer
+            return value * MetricSystem.MICROMETER
         else:
             return None