python3过大数据如何读取？

def readPart(filePath, size=1024, encoding="utf-8"):

    with open(filePath,"r",encoding=encoding) as f:

        while True:

            part = f.read(size) 

            if part:

                yield part

            else:

                return None

filePath = r"filePath"

size = 2048 # 每次读取指定大小的内容到内存

encoding = 'utf-8'

for part in readPart(filePath,size,encoding):

    print(part)

    # Processing data

with open(filePath) as f:

    for line in f:

        print(line)

        # Processing data