从pandas和unicod创建h2o数据帧

Question

如何安全地将pandas对象转换为h2o数据帧？

import h2o
import pandas as pd

df = pd.DataFrame({'col1': [1,1,2], 'col2': ['César Chávez Day', 'César Chávez Day', 'César Chávez Day']})
hf = h2o.H2OFrame(df)  #gives error

UnicodeEncodeError: 'ascii' codec can't encode character '\xe9' in position 4: ordinal not in range(128)

环境：Python3.5，水3.10.4.2