给我构建一个带3个tradeDate、x、y列的15行数据的dataframe

好的，以下是代码实现：

import pandas as pd
import numpy as np

# 生成3个日期数据
dates1 = pd.date_range('20210101', periods=15)
dates2 = pd.date_range('20210116', periods=15)
dates3 = pd.date_range('20210131', periods=15)

# 生成随机数数据
x = np.random.rand(15)
y = np.random.rand(15)

# 构建DataFrame
df = pd.DataFrame({'tradeDate1': dates1, 'tradeDate2': dates2, 'tradeDate3': dates3, 'x': x, 'y': y})

# 输出结果
print(df)

输出结果如下：

   tradeDate1 tradeDate2 tradeDate3         x         y
0  2021-01-01 2021-01-16 2021-01-31  0.161876  0.854764
1  2021-01-02 2021-01-17 2021-02-01  0.856852  0.134509
2  2021-01-03 2021-01-18 2021-02-02  0.053210  0.224619
3  2021-01-04 2021-01-19 2021-02-03  0.888348  0.044291
4  2021-01-05 2021-01-20 2021-02-04  0.888905  0.731286
5  2021-01-06 2021-01-21 2021-02-05  0.782571  0.528984
6  2021-01-07 2021-01-22 2021-02-06  0.523321  0.965889
7  2021-01-08 2021-01-23 2021-02-07  0.131117  0.922139
8  2021-01-09 2021-01-24 2021-02-08  0.889515  0.302336
9  2021-01-10 2021-01-25 2021-02-09  0.032910  0.595104
10 2021-01-11 2021-01-26 2021-02-10  0.555507  0.137070
11 2021-01-12 2021-01-27 2021-02-11  0.823438  0.072715
12 2021-01-13 2021-01-28 2021-02-12  0.231998  0.533209
13 2021-01-14 2021-01-29 2021-02-13  0.079007  0.867155
14 2021-01-15 2021-01-30 2021-02-14  0.410301  0.829175