python 读取 特殊一行500G的文件

#生成器解决
def myreadlines(f,newline): #f->文件句柄，newline->一行中的分割符
    buf = ""
    while True:
        while newline in buf:
            pos = buf.index(newline)
            yield buf[:pos]
            buf = buf[pos + len(newline):]
        chunk = f.read(4096*10)
        if not chunk:
            yield buf #文件末尾
            break
        buf += chunk
#测试
with open("input.txt") as f:
    for line in myreadlines(f,"{|}"):
        print(line)