add while circle in test py

local/test_supervisor.py

@@ -12,10 +12,11 @@ def con_sql(sql):
     return df
 
 if __name__ == "__main__":
-    now = datetime.now()
-    now_start = str(now)[:16] + ":00"
-    now_end = str(now)[:16] + ":59"
-    sql = "select device_id from user_active_time " \
-          "where active_time <= '{}' and active_time >= '{}'".format(now_end, now_start)
-    df = con_sql(sql)
-    print(df.head(1))
\ No newline at end of file
+    while True:
+        now = datetime.now()
+        now_start = str(now)[:16] + ":00"
+        now_end = str(now)[:16] + ":59"
+        sql = "select device_id from user_active_time " \
+              "where active_time <= '{}' and active_time >= '{}'".format(now_end, now_start)
+        df = con_sql(sql)
+        print(df.head(1))
\ No newline at end of file