tolist()的作用

import pandas as pd
from collections import Counter# 读取数据
train_data_path = './train_data.csv'
# pd.read_csv()：train_data <class 'pandas.core.frame.DataFrame'>
train_data = pd.read_csv(train_data_path,header=None,sep='\t')# 打印一下标签比例
# # Counter():统计不同数据类型的个数
print(dict(Counter(train_data[0].values)))# 打印若干数据展示一下
# .tolist()：直接将ndarray转换成列表
train_data1 = train_data.values.tolist()
print(train_data1[:10])