diff --git a/httprunner/context.py b/httprunner/context.py
index 1ececc13..5fd2ea5e 100644
--- a/httprunner/context.py
+++ b/httprunner/context.py
@@ -209,7 +209,7 @@ class Context(object):
         """ validate with functions
         """
         comparator = utils.get_uniform_comparator(validator_dict["comparator"])
-        validate_func = self.testcase_parser.get_bind_item("function", comparator)
+        validate_func = self.testcase_parser.get_bind_function(comparator)
 
         if not validate_func:
             raise exception.FunctionNotFound("comparator not found: {}".format(comparator))
diff --git a/httprunner/testcase.py b/httprunner/testcase.py
index 9ab83c2a..92ac525c 100644
--- a/httprunner/testcase.py
+++ b/httprunner/testcase.py
@@ -718,7 +718,7 @@ class TestcaseParser(object):
         """
         self.functions = functions
 
-    def get_bind_item(self, item_type, item_name):
+    def _get_bind_item(self, item_type, item_name):
         if item_type == "function":
             if item_name in self.functions:
                 return self.functions[item_name]
@@ -745,6 +745,12 @@ class TestcaseParser(object):
             raise exception.ParamsError(
                 "{} is not defined in bind {}s!".format(item_name, item_type))
 
+    def get_bind_function(self, func_name):
+        return self._get_bind_item("function", func_name)
+
+    def get_bind_variable(self, variable_name):
+        return self._get_bind_item("variable", variable_name)
+
     def parameterize(self, csv_file_name, fetch_method="Sequential"):
         parameter_file_path = os.path.join(
             os.path.dirname(self.file_path),
@@ -771,7 +777,7 @@ class TestcaseParser(object):
             if func_name in ["parameterize", "P"]:
                 eval_value = self.parameterize(*args, **kwargs)
             else:
-                func = self.get_bind_item("function", func_name)
+                func = self.get_bind_function(func_name)
                 eval_value = func(*args, **kwargs)
 
             func_content = "${" + func_content + "}"
@@ -804,7 +810,7 @@ class TestcaseParser(object):
         """
         variables_list = extract_variables(content)
         for variable_name in variables_list:
-            variable_value = self.get_bind_item("variable", variable_name)
+            variable_value = self.get_bind_variable(variable_name)
 
             if "${}".format(variable_name) == content:
                 # content is a variable