写了脚本，自动将 jupyter 导出的 markdown 中的

```
```

替换成

```
<img src="data:image/png;base64,iVBO...">
```

代码如下：

``` python
#! python3
import os
import re
import binascii

srcfil = r'C:\Users\WMX\Desktop\pylab\pylab.md'

srcdir = os.path.dirname(srcfil)
dstfil = os.path.join(srcdir, os.path.basename(srcfil).replace('.md', '_emb.md'))

img_base64 = {}
for root, dirs, files in os.walk(srcdir):
for fname in files:
if fname.endswith('.png'):
img_data = open(os.path.join(root, fname), 'rb').read()
img_base64[fname] = f'<img src="data:image/png;base64,{binascii.b2a_base64(img_data, newline=False).decode("latin-1")}">'

content = open(srcfil, 'r', encoding='utf-8').read()
for img in img_base64:
content = re.sub(f'\n!\[png\]\({img}\)\n', f'\n{img_base64[img]}\n', content)

open(dstfil, 'w', encoding='utf-8').write(content)

```