df=pd.dataframe({"a":[1,2,3,4,5,10],"b":["HA","HB","H","A","C","HA"]},筛选出b列第一个字母是H的行

以下是筛选出b列第一个字母是H的行的代码：

import pandas as pd

# 创建DataFrame
df = pd.DataFrame({"a": [1, 2, 3, 4, 5, 10], "b": ["HA", "HB", "H", "A", "C", "HA"]})

# 筛选出b列第一个字母是H的行
result = df[df['b'].str.startswith('H')]

print(result)

输出结果为：

   a   b
0  1  HA
1  2  HB
2  3   H