diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 598c0197e..6aa2b50d8 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -111,7 +111,8 @@ Code coverage measures the extent to which unit tests cover the code, helping id
 To generate a report showing the current code coverage, execute one of the following commands.
 
 To include all source files into coverage:
-```
+
+```bash
 coverage erase
 coverage run --source=. -m pytest .
 coverage html
diff --git a/camel/utils/python_interpreter.py b/camel/utils/python_interpreter.py
index 4dad4d927..a7bfc13fd 100644
--- a/camel/utils/python_interpreter.py
+++ b/camel/utils/python_interpreter.py
@@ -15,7 +15,7 @@
 import difflib
 import importlib
 import typing
-from typing import Any, Dict, List, Mapping, Optional
+from typing import Any, Dict, List, Optional
 
 
 class InterpreterError(ValueError):
@@ -165,6 +165,9 @@ def _execute_ast(self, expression: ast.AST) -> Any:
         elif isinstance(expression, ast.Call):
             # Function call -> return the value of the function call
             return self._execute_call(expression)
+        elif isinstance(expression, ast.Compare):
+            # Compare -> return True or False
+            return self._execute_condition(expression)
         elif isinstance(expression, ast.Constant):
             # Constant -> just return the value
             return expression.value
@@ -270,9 +273,11 @@ def _execute_subscript(self, subscript: ast.Subscript):
             return value[int(index)]
         if index in value:
             return value[index]
-        if isinstance(index, str) and isinstance(value, Mapping):
-            close_matches = difflib.get_close_matches(index,
-                                                      list(value.keys()))
+        if isinstance(index, str) and isinstance(value, dict):
+            close_matches = difflib.get_close_matches(
+                index,
+                [key for key in list(value.keys()) if isinstance(key, str)],
+            )
             if len(close_matches) > 0:
                 return value[close_matches[0]]
 
@@ -286,7 +291,7 @@ def _execute_name(self, name: ast.Name):
         else:
             raise InterpreterError(f"{name.ctx} is not supported.")
 
-    def _execute_condition(self, condition):
+    def _execute_condition(self, condition: ast.Compare):
         if len(condition.ops) > 1:
             raise InterpreterError(
                 "Cannot evaluate conditions with multiple operators")
@@ -316,10 +321,14 @@ def _execute_condition(self, condition):
         elif isinstance(comparator, ast.NotIn):
             return left not in right
         else:
-            raise InterpreterError(f"Operator not supported: {comparator}")
+            raise InterpreterError(f"Unsupported operator: {comparator}")
 
     def _execute_if(self, if_statement: ast.If):
         result = None
+        if not isinstance(if_statement.test, ast.Compare):
+            raise InterpreterError(
+                "Only Campare expr supported in if statement, get"
+                f" {if_statement.test.__class__.__name__}")
         if self._execute_condition(if_statement.test):
             for line in if_statement.body:
                 line_result = self._execute_ast(line)
diff --git a/test/utils/test_python_interpreter.py b/test/utils/test_python_interpreter.py
index 631d89eba..d5f688559 100644
--- a/test/utils/test_python_interpreter.py
+++ b/test/utils/test_python_interpreter.py
@@ -25,13 +25,29 @@ def action_function():
 
 @pytest.fixture()
 def interpreter():
-    action_space = {"action1": action_function}
+    action_space = {"action1": action_function, "str": str}
     white_list = ["torch", "numpy.array", "openai"]
     return PythonInterpreter(action_space=action_space,
                              import_white_list=white_list)
 
 
-def test_import_success0(interpreter):
+def test_state_update(interpreter: PythonInterpreter):
+    code = "x = input_variable"
+    input_variable = 10
+    execution_res = interpreter.execute(
+        code, state={"input_variable": input_variable})
+    assert execution_res == input_variable
+
+
+def test_syntax_error(interpreter: PythonInterpreter):
+    code = "x input_variable"
+    with pytest.raises(InterpreterError) as e:
+        interpreter.execute(code)
+    exec_msg = e.value.args[0]
+    assert "Syntax error in code: invalid syntax" in exec_msg
+
+
+def test_import_success0(interpreter: PythonInterpreter):
     code = """import torch as pt, openai
 a = pt.tensor([[1., -1.], [1., -1.]])
 openai.__version__"""
@@ -41,21 +57,21 @@ def test_import_success0(interpreter):
     assert isinstance(execution_res, str)
 
 
-def test_import_success1(interpreter):
+def test_import_success1(interpreter: PythonInterpreter):
     code = """from torch import tensor
 a = tensor([[1., -1.], [1., -1.]])"""
     execution_res = interpreter.execute(code)
     assert torch.equal(execution_res, torch.tensor([[1., -1.], [1., -1.]]))
 
 
-def test_import_success2(interpreter):
+def test_import_success2(interpreter: PythonInterpreter):
     code = """from numpy import array
 x = array([[1, 2, 3], [4, 5, 6]])"""
     execution_res = interpreter.execute(code)
     assert np.equal(execution_res, np.array([[1, 2, 3], [4, 5, 6]])).all()
 
 
-def test_import_fail0(interpreter):
+def test_import_fail0(interpreter: PythonInterpreter):
     code = """import os
 os.mkdir("/tmp/test")"""
     with pytest.raises(InterpreterError) as e:
@@ -66,7 +82,7 @@ def test_import_fail0(interpreter):
                         " white list (try to import os).")
 
 
-def test_import_fail1(interpreter):
+def test_import_fail1(interpreter: PythonInterpreter):
     code = """import numpy as np
 x = np.array([[1, 2, 3], [4, 5, 6]], np.int32)"""
     with pytest.raises(InterpreterError) as e:
@@ -77,13 +93,13 @@ def test_import_fail1(interpreter):
                         " white list (try to import numpy).")
 
 
-def test_action_space(interpreter):
+def test_action_space(interpreter: PythonInterpreter):
     code = "res = action1()"
     execution_res = interpreter.execute(code)
     assert execution_res == "access action function"
 
 
-def test_fuzz_space(interpreter):
+def test_fuzz_space(interpreter: PythonInterpreter):
     from PIL import Image
     fuzz_state = {"image": Image.new("RGB", (256, 256))}
     code = "output_image = input_image.crop((20, 20, 100, 100))"
@@ -92,7 +108,7 @@ def test_fuzz_space(interpreter):
     assert execution_res.height == 80
 
 
-def test_keep_state0(interpreter):
+def test_keep_state0(interpreter: PythonInterpreter):
     code1 = "a = 42"
     code2 = "b = a"
     code3 = "c = b"
@@ -108,7 +124,7 @@ def test_keep_state0(interpreter):
                         "The variable `b` is not defined.")
 
 
-def test_keep_state1(interpreter):
+def test_keep_state1(interpreter: PythonInterpreter):
     code1 = "from torch import tensor"
     code2 = "a = tensor([[1., -1.], [1., -1.]])"
     execution_res = interpreter.execute(code1, keep_state=True)
@@ -121,14 +137,14 @@ def test_keep_state1(interpreter):
                         "The variable `tensor` is not defined.")
 
 
-def test_assign0(interpreter):
+def test_assign0(interpreter: PythonInterpreter):
     code = "a = b = 1"
     interpreter.execute(code)
     assert interpreter.state["a"] == 1
     assert interpreter.state["b"] == 1
 
 
-def test_assign1(interpreter):
+def test_assign1(interpreter: PythonInterpreter):
     code = "a, b = c = 2, 3"
     interpreter.execute(code)
     assert interpreter.state["a"] == 2
@@ -136,7 +152,7 @@ def test_assign1(interpreter):
     assert interpreter.state["c"] == (2, 3)
 
 
-def test_assign_fail(interpreter):
+def test_assign_fail(interpreter: PythonInterpreter):
     code = "x = a, b, c = 2, 3"
     with pytest.raises(InterpreterError) as e:
         interpreter.execute(code, keep_state=False)
@@ -145,7 +161,7 @@ def test_assign_fail(interpreter):
                         "Expected 3 values but got 2.")
 
 
-def test_if(interpreter):
+def test_if0(interpreter: PythonInterpreter):
     code = """a = 0
 b = 1
 if a < b:
@@ -159,7 +175,49 @@ def test_if(interpreter):
     assert interpreter.state["b"] == 0
 
 
-def test_for(interpreter):
+def test_if1(interpreter: PythonInterpreter):
+    code = """a = 1
+b = 0
+if a < b:
+    t = a
+    a = b
+    b = t
+else:
+    b = a"""
+    interpreter.execute(code)
+    assert interpreter.state["a"] == 1
+    assert interpreter.state["b"] == 1
+
+
+def test_compare(interpreter: PythonInterpreter):
+    assert interpreter.execute("2 > 1") is True
+    assert interpreter.execute("2 >= 1") is True
+    assert interpreter.execute("2 < 1") is False
+    assert interpreter.execute("2 == 1") is False
+    assert interpreter.execute("2 != 1") is True
+    assert interpreter.execute("1 <= 1") is True
+    assert interpreter.execute("True is True") is True
+    assert interpreter.execute("1 is not str") is True
+    assert interpreter.execute("1 in [1, 2]") is True
+    assert interpreter.execute("1 not in [1, 2]") is False
+
+
+def test_oprators(interpreter: PythonInterpreter):
+    assert interpreter.execute("1 + 1") == 2
+    assert interpreter.execute("1 - 1") == 0
+    assert interpreter.execute("1 * 1") == 1
+    assert interpreter.execute("1 / 2") == 0.5
+    assert interpreter.execute("1 // 2") == 0
+    assert interpreter.execute("1 % 2") == 1
+    assert interpreter.execute("2 ** 2") == 4
+    assert interpreter.execute("10 >> 2") == 2
+    assert interpreter.execute("1 << 2") == 4
+    assert interpreter.execute("+1") == 1
+    assert interpreter.execute("-1") == -1
+    assert interpreter.execute("not True") is False
+
+
+def test_for(interpreter: PythonInterpreter):
     code = """l = [2, 3, 5, 7, 11]
 sum = 0
 for i in l:
@@ -168,14 +226,14 @@ def test_for(interpreter):
     assert execution_res == 28
 
 
-def test_subscript_access(interpreter):
+def test_subscript_access(interpreter: PythonInterpreter):
     code = """l = [2, 3, 5, 7, 11]
 res = l[3]"""
     execution_res = interpreter.execute(code)
     assert execution_res == 7
 
 
-def test_subscript_assign(interpreter):
+def test_subscript_assign(interpreter: PythonInterpreter):
     code = """l = [2, 3, 5, 7, 11]
 l[3] = 1"""
     with pytest.raises(InterpreterError) as e:
@@ -184,3 +242,36 @@ def test_subscript_assign(interpreter):
     assert exec_msg == ("Evaluation of the code stopped at node 1. See:\n"
                         "Unsupported variable type. Expected ast.Name or "
                         "ast.Tuple, got Subscript instead.")
+
+
+def test_dict(interpreter: PythonInterpreter):
+    code = """x = {1: 10, 2: 20}
+y = {"number": 30, **x}
+res = y[1] + y[2] + y["numbers"]"""
+    execution_res = interpreter.execute(code)
+    assert execution_res == 60
+
+
+def test_formatted_value(interpreter: PythonInterpreter):
+    code = """x = 3
+res = f"x = {x}"
+    """
+    execution_res = interpreter.execute(code)
+    assert execution_res == "x = 3"
+
+
+def test_joined_str(interpreter: PythonInterpreter):
+    code = """l = ["2", "3", "5", "7", "11"]
+res = ",".join(l)"""
+    execution_res = interpreter.execute(code)
+    assert execution_res == "2,3,5,7,11"
+
+
+def test_expression_not_support(interpreter: PythonInterpreter):
+    code = """x = 1
+x += 1"""
+    with pytest.raises(InterpreterError) as e:
+        interpreter.execute(code, keep_state=False)
+    exec_msg = e.value.args[0]
+    assert exec_msg == ("Evaluation of the code stopped at node 1. See:"
+                        "\nAugAssign is not supported.")