diff --git a/calculate/templates/template_engine.py b/calculate/templates/template_engine.py
index 0a17d90..4939428 100644
--- a/calculate/templates/template_engine.py
+++ b/calculate/templates/template_engine.py
@@ -1093,8 +1093,8 @@ class CalculateExtension(Extension):
                 check_template.render(__datavars__=self._datavars)
 
             elif (self._is_variable_name(self.stream.current)
-                  or self.stream.current.type == 'lparen'
-                  or self.stream.current.type == 'integer'
+                  or self.stream.current.type in {'lparen', 'integer',
+                                                  'float', 'string'}
                   or self.stream.current.value in self.CONDITION_NAME_TOKENS):
                 # разбираем условие. Если условие False -- кидаем исключение.
                 # condition_result = self.get_condition_result()
diff --git a/tests/templates/test_template_engine.py b/tests/templates/test_template_engine.py
index 2964cb6..5be0bc5 100644
--- a/tests/templates/test_template_engine.py
+++ b/tests/templates/test_template_engine.py
@@ -6,7 +6,9 @@ from calculate.templates.template_engine import TemplateEngine, Variables,\
 from calculate.templates.template_processor import TemplateExecutor
 
 
-CHROOT_PATH = os.path.join(os.getcwd(), 'tests/templates/testfiles/test_template_engine_root')
+CHROOT_PATH = os.path.join(
+                         os.getcwd(),
+                         'tests/templates/testfiles/test_template_engine_root')
 
 APPENDS_SET = TemplateExecutor(cl_config_path=os.path.join(
                                           CHROOT_PATH,
@@ -263,7 +265,23 @@ parameter_2 = {{ vars_1.var_1 }}'''
         text = template_engine.template_text
         assert text == output_text
 
-    @pytest.mark.parametrize('case',
+    def test_constant_value_in_the_begin_of_condition(self):
+        datavars_module = Variables({'vars_1':
+                                     Variables({'var_1':
+                                                ['a', 4.2, 'b', 'c']})})
+        input_template = '''{% calculate name = 'filename',
+'a' in vars_1.var_1, 4.2 in vars_1.var_1 -%}
+Template completed'''
+        output_text = 'Template completed'
+        template_engine = TemplateEngine(appends_set=APPENDS_SET,
+                                         datavars_module=datavars_module,
+                                         chroot_path=CHROOT_PATH)
+        template_engine.process_template_from_string(input_template, FILE)
+        text = template_engine.template_text
+        assert text == output_text
+
+    @pytest.mark.parametrize(
+        'case',
         [
             {
                 "name": "pattern not found",
@@ -300,8 +318,8 @@ parameter_2 = {{ vars_1.var_1 }}'''
                 "grep": "'/test_grep', '^STATUSLINE=true'",
                 "result": ""
             },
-    ], 
-    ids=lambda x:x["name"])
+        ],
+        ids=lambda x: x["name"])
     def test_grep(self, case):
         datavars_module = Variables({'vars_1':
                                      Variables({'var_1':
@@ -318,7 +336,8 @@ parameter_2 = {{ vars_1.var_1 }}'''
         text = template_engine.template_text
         assert text == output_text
 
-    @pytest.mark.parametrize('case',
+    @pytest.mark.parametrize(
+        'case',
         [
             {
                 "name": "exists directory",
@@ -345,8 +364,8 @@ parameter_2 = {{ vars_1.var_1 }}'''
                 "exists": "/test_exists_qwerty",
                 "result": ""
             },
-    ], 
-    ids=lambda x:x["name"])
+        ],
+        ids=lambda x: x["name"])
     def test_exists(self, case):
         datavars_module = Variables({'vars_1':
                                      Variables({'var_1':