yield 讀取檔案

read_chunk.py

def chunk(f, newline):
    buf = ""
    while True:
        while newline in buf:
            pos = buf.index(newline)
            yield buf[:pos]
            buf = buf[pos + len(newline):]
        chunk = f.read(1024)
        
        if not chunk:
            yield buf
            break
        buf += chunk
        

with open("log", 'r') as f:
    for idx, line in enumerate(chunk(f, '\n')):
        print(f"{idx}: {line}")