我发现pandas在将数据框转换为透视表时出现了奇怪的行为。
import pandas as pd
df = pd.DataFrame({'car_id': {0: 'Trabant', 1: 'Buick', 2: 'Dodge'}, 'car_order': {0: 2, 1: 1, 2: 14}, 'car_name': {0: 'Trabant', 1: 'Buick', 2: 'Dodge'}, 'car_rank': {0: 111111317.29, 1: 1111112324.0, 2: 1111112324.5}})
table = df.pivot_table(index=['car_id', 'car_name', 'car_order'], columns=[],values=['car_rank'], fill_value='',dropna=True)
print table
df1 = pd.DataFrame({'car_id': {0: 'Trabant', 1: 'Buick', 2: 'Dodge'}, 'car_order': {0: 2, 1: 1, 2: 14}, 'car_name': {0: 'Trabant', 1: 'Buick', 2: 'Dodge'}, 'car_rank': {0: 17.29, 1: 24.0, 2: 24.5}})
table1 = df1.pivot_table(index=['car_id', 'car_name', 'car_order'], columns=[],values=['car_rank'], fill_value='',dropna=True)
print table1
结果输出:
Table
car_rank
car_id car_name car_order
Buick Buick 1 1111112324
Dodge Dodge 14 1111112324
Trabant Trabant 2 111111317
Table 1
car_rank
car_id car_name car_order
Buick Buick 1 24.00
Dodge Dodge 14 24.50
Trabant Trabant 2 17.29
你知道为什么在表格中的值会被转换为整数,而在表格1中的值保持为浮点数吗?
pandas 0.18.0,python 2.7.9