完成lab3

Labs/Lab3/src/Receiver.py

@@ -1,6 +1,5 @@
 import socket
 import random
-import time
 
 class NetworkLayer:
     def __init__(self, host:str, port:int) -> None:

Labs/Lab3/src/Sender.py

@@ -96,6 +96,7 @@ class Sender:
         return time.time() - self.timer >= 0.001 * self.timeout_ms
     
     def gbn(self):
+        self.timer = time.time()
         seq_index = self.base_num
         while seq_index < self.next_seq_num:
             self.udt_send(
@@ -103,7 +104,6 @@ class Sender:
                 self.package_list[seq_index].seq_num
             )
             seq_index += 1
-        self.timer = time.time()
 
     def show_gbn(self) -> list[int]:
         show = []
@@ -127,7 +127,7 @@ if __name__ == "__main__":
         timeout_ms=2000, 
         networkLayer=networkLayer,
     )
-    instruct = input("按回车键开始传输：")
+    input("按回车键开始传输：")
   
     pkg_list = applicationLayer.data_to_send
     index = 1