python3过大数据如何读取?
python中读取大文件的方法:
1、利用yield生成器读取
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
2、利用open()自带方法生成迭代对象,这个是一行一行的读取
with open(filePath) as f:for line in f:
print(line)
# Processing data
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