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test-notes/编程/Python笔记.md

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+# Python 学习笔记
+
+Python 是一门优雅且强大的编程语言。
+
+## 基本语法
+
+```python
+# 列表推导式
+squares = [x**2 for x in range(10)]
+print(squares)  # [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
+
+# 字典推导式
+word_lengths = {word: len(word) for word in ['hello', 'world', 'python']}
+print(word_lengths)
+```
+
+## 装饰器
+
+```python
+def timer(func):
+    def wrapper(*args, **kwargs):
+        import time
+        start = time.time()
+        result = func(*args, **kwargs)
+        print(f"{func.__name__} took {time.time() - start:.4f}s")
+        return result
+    return wrapper
+
+@timer
+def slow_function():
+    import time
+    time.sleep(1)
+    return "Done"
+
+print(slow_function())
+```
+
+## 常用库
+
+1. **NumPy** - 科学计算
+2. **Pandas** - 数据分析
+3. **Flask** - Web 框架
+4. **Requests** - HTTP 请求