diff --git a/.gitignore b/.gitignore
index 09f9a02..e4094fe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 # VScode file
 .vscode/
-SR.code-workspace
+DR.code-workspace
 
 # PYCharm file
 .idea/
diff --git a/SR-PY.py b/Difficult_Rocket.py
similarity index 100%
rename from SR-PY.py
rename to Difficult_Rocket.py
diff --git a/bin/client.py b/bin/client.py
index 6c1b474..494208d 100644
--- a/bin/client.py
+++ b/bin/client.py
@@ -51,7 +51,7 @@ class RenderThread(mp.Process, pyglet.window.Window):
         self.part_list = tools.config('sys_value/parts.json5')
         self.map_view = [configs.basic_poi(poi_type='chunk')]
         # dic
-        self.ships = {}  # all ship
+        self.ships = {}  # all ship(part)
         self.planet_system = {}  # hole planet system
         # list
         # re stuff
diff --git a/bin/configs.py b/bin/configs.py
index d360c36..d845ee9 100644
--- a/bin/configs.py
+++ b/bin/configs.py
@@ -19,7 +19,7 @@ except ModuleNotFoundError:
 configs_logger = logging.getLogger('configs')
 
 
-def __basic_number(int_num=0, float_num=1, unit1=None, unit2=None) -> list:
+def _BasicNumber(int_num=0, float_num=1, unit1=None, unit2=None) -> list:
     if unit1 is None:
         unit1 = []
     if unit2 is None:
@@ -30,28 +30,47 @@ def __basic_number(int_num=0, float_num=1, unit1=None, unit2=None) -> list:
         return [int_num, decimal.Decimal(str(float_num)), unit1, unit2]  # no create a decimal class
 
 
-def basic_number(int_num=0, float_num=1, unit1=None, unit2=None, num=1) -> list:
+def BasicNumber(int_num=0, float_num=1, unit1=None, unit2=None, num=1) -> list:
     numbers = []
     if num > 1:
         for x in range(0, num, 1):
-            numbers.append(__basic_number(int_num, float_num, unit1, unit2))
+            numbers.append(_BasicNumber(int_num, float_num, unit1, unit2))
     elif num == 1:
-        return __basic_number(int_num, float_num, unit1, unit2)
+        return _BasicNumber(int_num, float_num, unit1, unit2)
     else:  # num < 1
-
         raise TypeError('you should give me a num with >= 1!')
     return numbers
 
 
+class BasicNumberClass:
+    def __init__(self, int_num=0, float_num=1, unit1=None, unit2=None):
+        self.int = int_num
+        self.float = decimal.Decimal(str(float_num))
+        if unit1:
+            self.units1 = unit1
+        else:
+            self.units1 = []
+        if unit2:
+            self.units2 = unit2
+        else:
+            self.units2 = []
+
+    def __str__(self):
+        return None
+
+    def __add__(self, other):
+        pass
+
+
 def basic_poi(poi_type=None) -> list:
     if poi_type is None:
-        return basic_number(unit1='m', num=2)
+        return BasicNumber(unit1='m', num=2)
     if poi_type == 'chunk':
-        return [basic_number(unit1='chunk', num=2), basic_number(unit1='m', num=2)]
+        return [BasicNumber(unit1='chunk', num=2), BasicNumber(unit1='m', num=2)]
 
 
 def basic_force() -> list:
-    return basic_number(unit1='N', num=2)
+    return BasicNumber(unit1='N', num=2)
 
 
 def configs(name, option=None) -> dict:
@@ -61,8 +80,9 @@ def configs(name, option=None) -> dict:
             try:
                 data = data[option]
             except IndexError as exp:
-                logging.exception(exp)
-                raise exp
+                log = 'can\'t find stack named %s in file %s' % (option, name)
+                configs_logger.exception(log)
+                raise IndexError(log)
         return data
 
 
diff --git a/bin/tools.py b/bin/tools.py
index 88879eb..b360109 100644
--- a/bin/tools.py
+++ b/bin/tools.py
@@ -157,7 +157,8 @@ def distance(A, B) -> float:
     A & B format: docs.basic_config:basic_poi
     """
     poi_dis = configs.basic_poi()
-    dis = decimal.Decimal('0.0')
+    for x in A, B:
+        x = decimal.Decimal(str(x))
     xd = A[0] - B[0]
     yd = A[1] - B[1]
     poi_dis[0] = xd
@@ -181,8 +182,9 @@ def config(file_name, stack=None):
         with open(file_name, "r") as jf:  # jf -> json file
             rd = json5.load(jf)
     except FileNotFoundError as exp:
-        tools_logger.exception("no config file \n file name : %s \n stack : %s" % (file_name, stack))
-        raise FileNotFoundError("no config file \n file name : %s \n stack : %s" % (file_name, stack))
+        log = "no config file \n file name : %s \n stack : %s" % (file_name, stack)
+        tools_logger.exception(log)
+        raise FileNotFoundError(log)
     if stack is not None:
         rd = rd[stack]
     return rd
diff --git a/test_tools.py b/test_tools.py
new file mode 100644
index 0000000..57dc77c
--- /dev/null
+++ b/test_tools.py
@@ -0,0 +1,3 @@
+from bin import tools
+
+tools.distance()