Do not use argparse

`argparse` is overkill here.

Overlap/Analysis/extract_component_nx.py

@@ -37,19 +37,15 @@ def add_component(G: nx.DiGraph, source: int):
             G.nodes[n]["component"] = component
 
 if __name__ == "__main__":
-    import argparse
-
-    # Parse arguments:
-    parser = argparse.ArgumentParser()
-    parser.add_argument("edgelist_file")
-    parser.add_argument(
-        "node", help="Select component containing node", type=int
-    )
-    args = parser.parse_args()
-
-    G = report_graph.read_eddy_graph(args.edgelist_file)
-    add_component(G, args.node)
-    H = G.subgraph(G.nodes[args.node]["component"])
+    import sys
+
+    if len(sys.argv) != 3:
+        sys.exit("Required arguments: input-file node-number")
+
+    node = int(sys.argv[2])
+    G = report_graph.read_eddy_graph(sys.argv[1])
+    add_component(G, node)
+    H = G.subgraph(G.nodes[node]["component"])
     len_H = len(H)
     print("Number of nodes:", len_H)
     print("Number of edges:", H.number_of_edges())