style: 统一代码格式并改进异常处理

- 将多行字符串调整为符合PEP 8的格式
- 统一使用显式的异常捕获（except Exception）
- 改进线程的daemon设置方式
- 移除未使用的异常变量和导入
- 修复文件末尾的换行符问题

src/downloader.py

@@ -1,6 +1,7 @@
 import requests
 import time
 
+
 def download_file(url, filepath, referer=None, log_callback=None):
     """
     [Data Layer] 文件下载执行器
@@ -9,7 +10,11 @@ def download_file(url, filepath, referer=None, log_callback=None):
     try:
         # 根据不同平台可能需要调整 Headers
         headers = {
-            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+            "User-Agent": (
+                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+                "AppleWebKit/537.36 (KHTML, like Gecko) "
+                "Chrome/120.0.0.0 Safari/537.36"
+            ),
         }
 
         # 优先使用传入的 referer
@@ -17,20 +22,14 @@ def download_file(url, filepath, referer=None, log_callback=None):
             headers["Referer"] = referer
         else:
             # 简单的 Referer 区分 (保留旧逻辑作为后备)
-            if (
+            if "bilibili.com" in url or "hdslb.com" in url or "bilivideo.com" in url:
-                "bilibili.com" in url
-                or "hdslb.com" in url
-                or "bilivideo.com" in url
-            ):
                 headers["Referer"] = "https://www.bilibili.com/"
             else:
                 headers["Referer"] = "https://www.douyin.com/"
 
         for i in range(3):
             try:
-                response = requests.get(
+                response = requests.get(url, headers=headers, stream=True, timeout=20)
-                    url, headers=headers, stream=True, timeout=20
-                )
                 if response.status_code == 200:
                     with open(filepath, "wb") as f:
                         for chunk in response.iter_content(chunk_size=1024 * 1024):
@@ -41,7 +40,8 @@ def download_file(url, filepath, referer=None, log_callback=None):
                     if i == 2:
                         if log_callback:
                             log_callback(
-                                f"下载请求失败: Status {response.status_code} | URL: {url[:30]}..."
+                                f"下载请求失败: Status {response.status_code} "
+                                f"| URL: {url[:30]}..."
                             )
             except requests.exceptions.RequestException as e:
                 if i == 2:

src/tasks/bilibili.py

@@ -5,13 +5,17 @@ import json
 import requests
 import concurrent.futures
 from datetime import datetime
-from tkinter import messagebox
 from DrissionPage import ChromiumPage, ChromiumOptions
 from src.downloader import download_file
 
 
 def run_bilibili_task(
-    target_url, target_count, save_root, browser_path, log_callback, finish_callback
+    target_url,
+    target_count,
+    save_root,
+    browser_path,
+    log_callback,
+    finish_callback=None,
 ):
     """
     [Control Layer] B站核心业务流程
@@ -85,7 +89,7 @@ def run_bilibili_task(
                         next_btn.click()
                         no_new_data_count = 0
                         time.sleep(2)
-                except:
+                except Exception:
                     pass
             else:
                 no_new_data_count = 0
@@ -146,7 +150,7 @@ def run_bilibili_task(
         if dp:
             try:
                 dp.close()
-            except:
+            except Exception:
                 pass
     finally:
         # 这里需要一种机制通知UI线程结束，或者由UI层处理
@@ -218,7 +222,11 @@ def get_bilibili_play_url(bvid):
     """
     url = f"https://www.bilibili.com/video/{bvid}"
     headers = {
-        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+        "User-Agent": (
+            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+            "AppleWebKit/537.36 (KHTML, like Gecko) "
+            "Chrome/120.0.0.0 Safari/537.36"
+        ),
         "Referer": "https://www.bilibili.com/",
     }
     try:

src/tasks/douyin.py

@@ -5,7 +5,15 @@ from datetime import datetime
 from DrissionPage import ChromiumPage, ChromiumOptions
 from src.downloader import download_file
 
-def run_douyin_task(target_url, target_count, save_root, browser_path, log_callback, finish_callback):
+
+def run_douyin_task(
+    target_url,
+    target_count,
+    save_root,
+    browser_path,
+    log_callback,
+    finish_callback,
+):
     """
     [Control Layer] 抖音核心业务流程
     1. 启动浏览器
@@ -53,7 +61,7 @@ def run_douyin_task(target_url, target_count, save_root, browser_path, log_callb
                                 ):
                                     collected_works.append(aweme)
                                     found_new = True
-                except:
+                except Exception:
                     pass
 
             log_callback(f"已获取作品信息: {len(collected_works)}/{target_count}")
@@ -99,7 +107,11 @@ def run_douyin_task(target_url, target_count, save_root, browser_path, log_callb
                 file_name_base = f"{date_str}({count_idx})"
 
             download_tasks.append(
-                {"work": work, "index": index, "file_name_base": file_name_base}
+                {
+                    "work": work,
+                    "index": index,
+                    "file_name_base": file_name_base,
+                }
             )
 
         # 使用线程池执行下载
@@ -115,7 +127,7 @@ def run_douyin_task(target_url, target_count, save_root, browser_path, log_callb
                         len(works_to_process),
                         save_root,
                         task["file_name_base"],
-                        log_callback
+                        log_callback,
                     )
                 )
 
@@ -133,12 +145,15 @@ def run_douyin_task(target_url, target_count, save_root, browser_path, log_callb
         if dp:
             try:
                 dp.close()
-            except:
+            except Exception:
                 pass
     finally:
         pass
 
-def process_douyin_work(work, index, total_count, save_root, file_name_base, log_callback):
+
+def process_douyin_work(
+    work, index, total_count, save_root, file_name_base, log_callback
+):
     """
     [Data Layer] 单个任务处理逻辑 (Worker)
     判断作品类型(视频/图文)，生成路径并调用下载器
@@ -148,9 +163,11 @@ def process_douyin_work(work, index, total_count, save_root, file_name_base, log
         if "images" in work and work["images"]:
             is_video = False
 
-        log_callback(
+        msg = (
-            f"[{index + 1}/{total_count}] {file_name_base} | {'视频' if is_video else '图文'} | 下载中..."
+            f"[{index + 1}/{total_count}] {file_name_base} | "
+            f"{'视频' if is_video else '图文'} | 下载中..."
         )
+        log_callback(msg)
 
         if is_video:
             video_url = work["video"]["play_addr"]["url_list"][0]
@@ -158,7 +175,7 @@ def process_douyin_work(work, index, total_count, save_root, file_name_base, log
             if not os.path.exists(file_path):
                 if download_file(video_url, file_path, log_callback=log_callback):
                     log_callback(
-                        f"[{index + 1}/{total_count}] {file_name_base} -> 下载完成"
+                        f"[{index + 1}/{total_count}] {file_name_base} " "-> 下载完成"
                     )
                 else:
                     log_callback(
@@ -166,7 +183,8 @@ def process_douyin_work(work, index, total_count, save_root, file_name_base, log
                     )
             else:
                 log_callback(
-                    f"[{index + 1}/{total_count}] {file_name_base} -> 文件已存在，跳过"
+                    f"[{index + 1}/{total_count}] {file_name_base} "
+                    "-> 文件已存在，跳过"
                 )
         else:
             img_folder = os.path.join(save_root, file_name_base)

src/ui/app.py

@@ -123,12 +123,18 @@ class DouyinDownloaderApp:
         frame_platform.pack(padx=10, pady=5, fill="x")
 
         rb_douyin = tk.Radiobutton(
-            frame_platform, text="抖音", variable=self.platform_var, value="douyin"
+            frame_platform,
+            text="抖音",
+            variable=self.platform_var,
+            value="douyin",
         )
         rb_douyin.pack(side="left", padx=10)
 
         rb_bilibili = tk.Radiobutton(
-            frame_platform, text="B站", variable=self.platform_var, value="bilibili"
+            frame_platform,
+            text="B站",
+            variable=self.platform_var,
+            value="bilibili",
         )
         rb_bilibili.pack(side="left", padx=10)
 
@@ -223,8 +229,8 @@ class DouyinDownloaderApp:
         thread = threading.Thread(
             target=self.run_task,
             args=(url, int(count_str), save_path, browser_path, platform),
+            daemon=True,
         )
-        thread.daemon = True
         thread.start()
 
     def run_task(self, target_url, target_count, save_root, browser_path, platform):

video_downloader.py

@@ -2,10 +2,13 @@ import tkinter as tk
 from src.ui.app import DouyinDownloaderApp
 
 # 运行脚本 (使用 my_env 环境):
-# D:\ProgramData\anaconda3\envs\my_env\python.exe "D:\Code\doing_exercises\programs\Video Downloader\video_downloader.py"
+# D:\ProgramData\anaconda3\envs\my_env\python.exe video_downloader.py
 #
 # 打包成 exe (使用 my_env 环境):
-# D:\ProgramData\anaconda3\envs\my_env\python.exe -m nuitka --standalone --mingw64 --show-memory --show-progress --output-dir=build_nuitka --enable-plugin=tk-inter --include-data-dir=ico=ico --windows-icon-from-ico=ico\video_downloader.ico --main=video_downloader.py
+# D:\ProgramData\anaconda3\envs\my_env\python.exe -m nuitka --standalone ^
+# --mingw64 --show-memory --show-progress --output-dir=build_nuitka ^
+# --enable-plugin=tk-inter --include-data-dir=ico=ico ^
+# --windows-icon-from-ico=ico\video_downloader.ico --main=video_downloader.py
 
 # 主函数入口
 if __name__ == "__main__":
@@ -13,7 +16,7 @@ if __name__ == "__main__":
         root = tk.Tk()
         app = DouyinDownloaderApp(root)
         root.mainloop()
-    except Exception as e:
+    except Exception:
         import traceback
 
         with open("error_log.txt", "w") as f: