From c8c0ef16202c6ddcc0ad71a9b87ab6d791593c8c Mon Sep 17 00:00:00 2001
From: Dang Zerong <zerong.dang@t-systems.com>
Date: Fri, 13 Mar 2026 21:00:53 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B5=8B=E8=AF=95=E7=9A=84=E6=89=AB=E6=8F=8F?=
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---
 test_demo/demo_flaws.py | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/test_demo/demo_flaws.py b/test_demo/demo_flaws.py
index 7bb9262..57a7308 100644
--- a/test_demo/demo_flaws.py
+++ b/test_demo/demo_flaws.py
@@ -36,4 +36,34 @@ def missing_spaces():
     x=1+2
     y=3*4
     if x==1:
-        print(x)
\ No newline at end of file
+        print(x)
+
+
+# 缺陷1: 未使用的导入
+import unused_module  # 未使用
+import collections as col  # 使用了 col 但 flake8 可能检测
+
+
+# 缺陷2: 未使用的变量
+def unused_variable_demo():
+    """演示未使用的变量"""
+    result = calculate()  # result 未被使用
+    print("Function executed")
+
+
+def calculate():
+    """计算并返回结果"""
+    return 42
+
+
+# 缺陷3: 未定义的变量
+def undefined_variable_demo():
+    """演示未定义的变量"""
+    print(undefined_var)  # undefined_var 未定义
+
+
+# 缺陷4: 变量在定义前使用
+def use_before_define():
+    """在定义前使用变量"""
+    print(before_var)  # before_var 在下面才定义
+    before_var = 100