MNT #126 unusual case

prjemian · Aug 17, 2019 · 7b40288 · 7b40288
1 parent a11beaa
commit 7b40288
Showing 1 changed file with 10 additions and 7 deletions.
diff --git a/src/spec2nexus/spec.py b/src/spec2nexus/spec.py
@@ -241,17 +241,20 @@ def __init__(self, filename):
         self.headers = []
         self.scans = OrderedDict()
         self.readOK = -1
-        if not os.path.exists(filename):
-            raise SpecDataFileNotFound('file does not exist: ' + str(filename))
-        if not is_spec_file(filename):
-            raise NotASpecDataFile('not a SPEC data file: ' + str(filename))
-        self.fileName = filename
-
         self.last_scan = None
         self.mtime = 0
         self.num_lines = 0
 
-        self.read()
+        if filename is not None:
+            if not os.path.exists(filename):
+                raise SpecDataFileNotFound(
+                    'file does not exist: ' + str(filename))
+            if not is_spec_file(filename):
+                raise NotASpecDataFile(
+                    'not a SPEC data file: ' + str(filename))
+            self.fileName = filename
+
+            self.read()
 
     def __str__(self):
         return self.fileName or 'None'