diff --git a/untils/pdd_api b/untils/pdd_api.py
similarity index 93%
rename from untils/pdd_api
rename to untils/pdd_api.py
index 99a8f19..dd36e5f 100644
--- a/untils/pdd_api
+++ b/untils/pdd_api.py
@@ -4,6 +4,7 @@ import time
 
 PDD_API_ROOT = 'https://gw-api.pinduoduo.com/api/router'
 
+
 class PddApiClient(object):
     def __init__(self, app_key, secret_key):
         self.app_key = app_key
@@ -11,7 +12,8 @@ class PddApiClient(object):
 
     def get_sign(self, params):
         params_list = sorted(list(params.items()), key=lambda x: x[0])
-        params_bytes = (self.secret_key + ''.join("%s%s" % (k, v) for k, v in params_list) + self.secret_key).encode('utf-8')
+        params_bytes = (self.secret_key + ''.join("%s%s" % (k, v) for k, v in params_list) + self.secret_key).encode(
+            'utf-8')
         sign = hashlib.md5(params_bytes).hexdigest().upper()
         return sign
 
@@ -29,7 +31,8 @@ class PddApiClient(object):
         resp = requests.get(PDD_API_ROOT, params=params, **kwargs)
         print(resp.url)
         return resp
-        
+
+
 if __name__ == '__main__':
     pass
     # pdd = PddApiClient(app_key='', secret_key='')