当数据文件过大时，由于计算机内存有限，需要对大文件进行分块读取：
import pandas as pd
f = open('E:/学习相关/Python/数据样例/用户侧数据/test数据.csv')
reader = pd.read_csv(f, sep=',', iterator=True)
loop = True
chunkSize = 100000
chunks = []
while loop:
try:
chunk = reader.get_chunk(chunkSize)
chunks.append(chunk)
except StopIteration:
loop
