摘要: 1 import pandas as pd 2 import numpy as np 3 4 df = pd.DataFrame({ 5 'key1': [4, 5, 3, np.nan, 2], 6 'key2': [1, 2, np.nan, 4, 5], 7 'key3': [1, 2, 3, 阅读全文
posted @ 2019-04-29 21:29 xsan 阅读(1946) 评论(0) 推荐(0) 编辑