import numpy as np
import pandas as pd
print(df.to_markdown())
'''
| | A | B | C |
|:---|----:|----:|:----|
| x | 1 | 4 | p |
| y | 2 | 5 | q |
| z | 3 | 6 | r |
'''
# 不需要索引
print(df.to_markdown(index=False))
# 填充空值
print(df.fillna('').to_markdown(index=False))