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