don't print edge only connected patterns header if none present

Author: joernhees

serialization.py

@@ -27,6 +27,7 @@
 from graph_pattern import GraphPattern
 from gtp_scores import GTPScores
 from utils import decurify
+from utils import run_once
 
 logger = logging.getLogger(__name__)
 
@@ -235,15 +236,19 @@ def print_results(
             print_graph_pattern(gp)
 
     if edge_only_connected_patterns:
-        print(
-            '\n\n\nThe following edge only connected or mixed node and edge '
-            'vars patterns made it into raw result patterns:\n'
-        )
+        @run_once
+        def lazy_print_header():
+            print(
+                '\n\n\nThe following edge only connected or mixed node and edge'
+                ' vars patterns made it into raw result patterns:\n'
+            )
         for gp, run in result_patterns:
             if gp.is_edge_connected_only():
+                lazy_print_header()
                 print('edge connected only pattern:')
                 print_graph_pattern(gp, 0)
             if gp.mixed_node_edge_vars():
+                lazy_print_header()
                 print('mixed node and edge vars in pattern:')
                 print_graph_pattern(gp, 0)
 

utils.py

@@ -243,6 +243,17 @@ def get_path(nested, key_path, default=None):
     return nested
 
 
+def run_once(func):
+    """Decorator that causes a function to be executed only once."""
+    @wraps(func)
+    def wrapper(*args, **kwds):
+        if not wrapper.ran:
+            wrapper.ran = True
+            return func(*args, **kwds)
+    wrapper.ran = False
+    return wrapper
+
+
 def sample_from_list(l, probs, max_n=None):
     """Sample list according to probs.