Added pipes to intcode

intcode.py

@@ -9,6 +9,9 @@ class WaitForInput(Exception):
 class Halted(Exception):
     pass
 
+class PipeError(Exception):
+    pass
+
 class defaultlist(list):
     """Default list class. Allows writing and reading out of bounds."""
     def __init__(self, lst, val_factory):
@@ -207,6 +210,21 @@ class Interpreter(object):
             pass
         return self.IO.flush()
 
+    def pipe_from(self, other):
+        class Output(Exception):
+            pass
+        def raise_output(o):
+            raise Output(o)
+        other.comp.out_f = raise_output
+        def get_input():
+            try:
+                other.run()
+                raise PipeError
+            except Output as o:
+                return int(str(o))
+        self.comp.in_f = get_input
+        self.IO.write = other.IO.write
+
 
     def copy(self):
         memory = self.memory.copy()