improve merge script

utils/merge.py

@@ -3,21 +3,10 @@ import argparse
 import netaddr
 
 
-def read(fh):
-    for line in fh:
-        yield line.rstrip()
-
-    fh.close()
-
-
-def merge(fh):
-    for addr in netaddr.cidr_merge(read(fh)):
-        print(addr)
-
-
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(description='Merge IP addresses into the smallest possible list of CIDRs.')
     parser.add_argument('--source', nargs='?', type=argparse.FileType('r'), required=True, help='Source file path')
     args = parser.parse_args()
 
-    merge(args.source)
+    for addr in netaddr.cidr_merge(args.source.readlines()):
+        print(addr)