#4578: fix has_key() usage in compiler package.
diff --git a/Lib/compiler/pyassem.py b/Lib/compiler/pyassem.py
index 893fa64..6efec28 100644
--- a/Lib/compiler/pyassem.py
+++ b/Lib/compiler/pyassem.py
@@ -210,7 +210,7 @@
     order = []
     seen[b] = b
     for c in b.get_children():
-        if seen.has_key(c):
+        if c in seen:
             continue
         order = order + dfs_postorder(c, seen)
     order.append(b)
@@ -406,7 +406,7 @@
         seen = {}
 
         def max_depth(b, d):
-            if seen.has_key(b):
+            if b in seen:
                 return d
             seen[b] = 1
             d = d + depth[b]
@@ -482,7 +482,7 @@
         for name in self.cellvars:
             cells[name] = 1
         self.cellvars = [name for name in self.varnames
-                         if cells.has_key(name)]
+                         if name in cells]
         for name in self.cellvars:
             del cells[name]
         self.cellvars = self.cellvars + cells.keys()