allow lowercase inscode

Eugene Baulin · Eugene Baulin · commit 93a39e94e727 · 2023-02-22T14:42:45.000+01:00
diff --git a/urslib2/Tools.py b/urslib2/Tools.py
@@ -375,7 +375,7 @@ def pdbnum_to_float(number) -> 'like "128A" -> 128.03':
 
     number = pdbnum(number)
 
-    return float(number[:-1]) + letter_weight[number[-1]]
+    return float(number[:-1]) + letter_weight[number[-1].upper()]
 
 def Atom(string):
 
