created Log

log.py

@@ -0,0 +1,42 @@
+import utils
+import json
+import os
+import datetime as dt
+
+class Log():
+
+    def __init__(self, path):
+        self.path = path
+        self.log = self._load_json_file(self.path)
+
+    def _load_json_file(self, path):
+        # if not exist return empty dict
+        if not os.path.exists(path):
+            return {}
+        # problem loading file return empty dict
+        try:
+            with open(path, 'r') as json_file:
+                data = json.load(json_file)
+                return data
+        except:
+            return {}
+
+    def _save_json_file(self, path, data):
+        with open(path, 'w') as json_file:
+            json.dump(data, json_file, indent=4)
+
+    def update_log(self, key):
+        self.log[key] = utils.time_in_beijing().strftime('%Y-%m-%d %H:%M:%S')
+        self._save_json_file(self.path, self.log)
+
+    def get_time(self, key):
+        time_str = self.log.get(key, None)
+        if time_str is None:
+            return None
+        return dt.datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S')
+
+
+if __name__ == '__main__':
+    log = Log('instance/log.json')
+    log.update_log('stock_update')
+    # print(log.log)