摘要：
```python import matplotlib.image as mpimg import numpy as np def rgb2gray(rgb): return np.dot(rgb[..., :3], [0.2989, 0.5870, 0.1140]) img = mpimg.imr 阅读全文
摘要：
```python """ Plot Tupper's self referential formula """ import textwrap import matplotlib.pyplot as plt K = 48584506361897134235820959624942020445814 阅读全文