diff --git a/scripts/gdb/commands.py b/scripts/gdb/commands.py
index 998c15ac63b1506dec88060cd49b8cc8caff4da4..76d255fe2699a7084aad955ae8d2045d662b293c 100644
--- a/scripts/gdb/commands.py
+++ b/scripts/gdb/commands.py
@@ -1,3 +1,4 @@
+import sys
 import gdb
 
 import re
@@ -199,12 +200,14 @@ class MegengineInfo(gdb.Command):
         return ["opr", "trf"]
 
 
-
-MegengineBacktrace()
-MegengineBreakApply()
-MegengineUp()
-MegengineDown()
-MegengineInfo()
-MegengineWatch()
-
-gdb.Breakpoint("mgb::imperative::debug::notify_event(char const*)")
\ No newline at end of file
+if sys.version_info.major > 2:
+    MegengineBacktrace()
+    MegengineBreakApply()
+    MegengineUp()
+    MegengineDown()
+    MegengineInfo()
+    MegengineWatch()
+    
+    gdb.Breakpoint("mgb::imperative::debug::notify_event(char const*)")
+else:
+    print("skip import commands")
diff --git a/scripts/gdb/pretty_printers.py b/scripts/gdb/pretty_printers.py
index d7dd65b63179dafbb8697c5941975431d5f50188..ef17f4ff331860a1850575a29efe4a47acd47070 100644
--- a/scripts/gdb/pretty_printers.py
+++ b/scripts/gdb/pretty_printers.py
@@ -1,3 +1,4 @@
+import sys
 import gdb
 import gdb.printing
 import gdb.types
@@ -170,23 +171,26 @@ class SpanPrinter:
             yield "[{}]".format(i), (self.begin+i).dereference()
 
 
-pp = gdb.printing.RegexpCollectionPrettyPrinter("MegEngine")
+if sys.version_info.major > 2:
+    pp = gdb.printing.RegexpCollectionPrettyPrinter("MegEngine")
 # megdnn
-pp.add_printer('megdnn::SmallVectorImpl', '^megdnn::SmallVector(Impl)?<.*>$', SmallVectorPrinter)
-pp.add_printer('megdnn::TensorLayout', '^megdnn::TensorLayout$', ToStringPrinter)
-pp.add_printer('megdnn::TensorShape', '^megdnn::TensorShape$', ToStringPrinter)
+    pp.add_printer('megdnn::SmallVectorImpl', '^megdnn::SmallVector(Impl)?<.*>$', SmallVectorPrinter)
+    pp.add_printer('megdnn::TensorLayout', '^megdnn::TensorLayout$', ToStringPrinter)
+    pp.add_printer('megdnn::TensorShape', '^megdnn::TensorShape$', ToStringPrinter)
 # megbrain
-pp.add_printer('mgb::CompNode', '^mgb::CompNode$', ToStringPrinter)
-pp.add_printer('mgb::Maybe', '^mgb::Maybe<.*>$', MaybePrinter)
+    pp.add_printer('mgb::CompNode', '^mgb::CompNode$', ToStringPrinter)
+    pp.add_printer('mgb::Maybe', '^mgb::Maybe<.*>$', MaybePrinter)
 # imperative
-pp.add_printer('mgb::imperative::LogicalTensorDesc', '^mgb::imperative::LogicalTensorDesc$', LogicalTensorDescPrinter)
-pp.add_printer('mgb::imperative::OpDef', '^mgb::imperative::OpDef$', OpDefPrinter)
-pp.add_printer('mgb::imperative::Subgraph', '^mgb::imperative::Subgraph$', ReprPrinter)
-pp.add_printer('mgb::imperative::EncodedSubgraph', '^mgb::imperative::EncodedSubgraph$', ReprPrinter)
+    pp.add_printer('mgb::imperative::LogicalTensorDesc', '^mgb::imperative::LogicalTensorDesc$', LogicalTensorDescPrinter)
+    pp.add_printer('mgb::imperative::OpDef', '^mgb::imperative::OpDef$', OpDefPrinter)
+    pp.add_printer('mgb::imperative::Subgraph', '^mgb::imperative::Subgraph$', ReprPrinter)
+    pp.add_printer('mgb::imperative::EncodedSubgraph', '^mgb::imperative::EncodedSubgraph$', ReprPrinter)
 # imperative dispatch
-pp.add_printer('mgb::imperative::ValueRef', '^mgb::imperative::ValueRef$', ToStringPrinter)
-pp.add_printer('mgb::imperative::Span', '^mgb::imperative::Span<.*>$', SpanPrinter)
-gdb.printing.register_pretty_printer(gdb.current_objfile(), pp)
+    pp.add_printer('mgb::imperative::ValueRef', '^mgb::imperative::ValueRef$', ToStringPrinter)
+    pp.add_printer('mgb::imperative::Span', '^mgb::imperative::Span<.*>$', SpanPrinter)
+    gdb.printing.register_pretty_printer(gdb.current_objfile(), pp)
+else:
+    print("skip import pretty printers")
 
 
 def override_pretty_printer_for(val):
@@ -201,4 +205,5 @@ def override_pretty_printer_for(val):
             return HandlePrinter(val)
 
 
-gdb.pretty_printers.append(override_pretty_printer_for)
+if sys.version_info.major > 2:
+    gdb.pretty_printers.append(override_pretty_printer_for)
diff --git a/scripts/gdb/xmethods.py b/scripts/gdb/xmethods.py
index 6f4d326ef0e2593ef4cabd58e3c40a77a40d73c5..9dfc54f87f10eb33c03ebac125ce68356b1eb2d6 100644
--- a/scripts/gdb/xmethods.py
+++ b/scripts/gdb/xmethods.py
@@ -1,3 +1,4 @@
+import sys
 import re
 
 import gdb
@@ -48,4 +49,5 @@ class SmallVectorImplMatcher(gdb.xmethod.XMethodMatcher):
                 return SmallVectorImplWorker_size(class_type.template_argument(0))
 
 
-gdb.xmethod.register_xmethod_matcher(None, SmallVectorImplMatcher())
+if sys.version_info.major > 2:
+    gdb.xmethod.register_xmethod_matcher(None, SmallVectorImplMatcher())