refact: change ugly key search in datx dict

ZygoDatx.py

@@ -84,7 +84,7 @@ class DatxFile(object):
 
         h5file=h5.File(self.filepath, 'r')
 
-        if h5file['Attributes'].attrs.__contains__('File Layout Version'):
+        if 'File Layout Version' in h5file['Attributes'].attrs :
             self.fileversion=h5file['Attributes'].attrs['File Layout Version'][0]
         else:
             self.fileversion=0
@@ -134,7 +134,8 @@ class DatxFile(object):
         #  converters are not formatted the same by MX and MetroPro
         # dsSurf=h5file[self.metatree['Measurement']['Surface']['Path'].value]
         # return [dsSurf.attrs['X Converter'][0][2][1], dsSurf.attrs['Y Converter'][0][2][1] ]
-        if self.attributes.__contains__('Data Context.Lateral Resolution:Value'):
+
+        if 'Data Context.Lateral Resolution:Value' in self.attributes:
             return self.attributes['Data Context.Lateral Resolution:Value'][0] 
         else:
             raise OSError("DATX format Error:  cannot find lateral resolution info")
@@ -152,7 +153,8 @@ class DatxFile(object):
         softlist=('Mx','MetroPro', 'MetroBASIC', 'd2bug')
         print("Content of file", self.filepath)
         self.metatree.dump(1)
-        if self.attributes.__contains__('Data Context.Data Attributes.Software Info Name'):
+
+        if 'Data Context.Data Attributes.Software Info Name' in self.attributes:
             print("Acquisition software", self.attributes['Data Context.Data Attributes.Software Info Name'][0], "version",
                    self.attributes['Data Context.Data Attributes.Software Info Version'][0] )