[scanbase] use index with urls values instead of index. Index might not start at 0

tomoscan/scanbase.py

@@ -268,10 +268,10 @@ class TomoScanBase:
 
         :warning: each url should contain only one radio.
 
-        :param urls: ordered list with all the urls. First url should be
+        :param urls: dict with all the urls. First url should be
                      the first radio acquire, last url should match the last
                      radio acquire.
-        :type: list
+        :type: dict
         :param n_projection: number of projection for the sample.
         :type: int
         :param scan_range: acquisition range (usually 180 or 360)
@@ -283,17 +283,18 @@ class TomoScanBase:
                  are incoherent
         """
         assert n_projection is not None
-        ordered_url = OrderedDict(sorted(urls.items(), key= lambda x: x))
+        ordered_url = OrderedDict(sorted(urls.items(), key=lambda x: x))
 
         res = {}
         # deal with the 'standard' acquisitions
         for proj_i in range(n_projection):
+            url = list(ordered_url.values())[proj_i]
             if n_projection == 1:
                 angle = 0.0
             else:
                 angle = proj_i * scan_range / (n_projection - 1)
             if proj_i < len(urls):
-                res[angle] = urls[proj_i]
+                res[angle] = url
 
         if len(urls) > n_projection:
             # deal with extra images (used to check if the sampled as moved for