adapted the code to use only the segments of the gfa file to handle smaller files

Graph_gff.py

@@ -231,14 +231,13 @@ def graph_gaf(graph_gaf_file,segments_file):
 
     graph_gaf_file.close()
 
-def get_segments_length(gfa):
-    file_gfa=open(gfa,'r')
-    lines_gfa=file_gfa.readlines()
-    file_gfa.close()
+def get_segments_length(segments):
+    file_segments=open(segments,'r')
+    lines_segments=file_segments.readlines()
+    file_segments.close()
     seg_len={}
-    for line in lines_gfa:
+    for line in lines_segments:
         line=line.split()
-        if (line[0]=="S"): # get the length of the segment
-            seg_id='s'+line[1]
-            seg_len[seg_id]=len(line[2])
+        seg_id='s'+line[1]
+        seg_len[seg_id]=len(line[2])
     return seg_len
\ No newline at end of file