diff --git a/src/stub/scripts/bin2h.py b/src/stub/scripts/bin2h.py
index be677501..65b1dcd3 100644
--- a/src/stub/scripts/bin2h.py
+++ b/src/stub/scripts/bin2h.py
@@ -326,7 +326,7 @@ def main(argv):
     r_methods.reverse()
     for method in r_methods:
         method, odata = compress_stub(method, idata)
-        if mdata_odata.has_key(method):
+        if method in mdata_odata:
             assert mdata_odata[method] == odata
         else:
             mdata_odata[method] = odata
diff --git a/src/stub/scripts/xstrip.py b/src/stub/scripts/xstrip.py
index 1de4f087..cf07c302 100644
--- a/src/stub/scripts/xstrip.py
+++ b/src/stub/scripts/xstrip.py
@@ -88,7 +88,7 @@ def check_dump(dump_fn):
         assert int(f[0], 10) == len(sections)
         e = f[1], int(f[2], 16), int(f[5], 16), int(f[6][3:], 10), len(sections)
         sections.append(e)
-        assert not section_names.has_key(e[0]), e
+        assert not e[0] in section_names, e
         assert not e[0].endswith(":"), ("bad section name", e)
         section_names[e[0]] = e
     ##print (sections)
diff --git a/src/stub/src/arch/i086/cleanasm.py b/src/stub/src/arch/i086/cleanasm.py
index 1061ef7c..f5a830c9 100644
--- a/src/stub/src/arch/i086/cleanasm.py
+++ b/src/stub/src/arch/i086/cleanasm.py
@@ -99,11 +99,11 @@ def main(argv):
             k, v = m.group(1).strip(), [0, 0, None, 0]
         assert k and v, (inst, args)
         v[2] = k                # new name
-        if labels.has_key(k):
+        if k in labels:
             assert labels[k][:2] == v[:2]
         return k, v
     def add_label(k, v):
-        if labels.has_key(k):
+        if k in labels:
             assert labels[k][:2] == v[:2]
         else:
             labels[k] = v
@@ -449,7 +449,7 @@ def main(argv):
     ofp = open(ofile, "wb")
     current_label = None
     for label, inst, args, args_label in olines:
-        if labels.has_key(label):
+        if label in labels:
             current_label = labels[label][2]
             if opts.verbose:
                 ofp.write("%s: /* %d */\n" % (labels[label][2], labels[label][3]))