試圖從copyfileobj獲得在Python

Question

from threading import Thread 

src_file = 'test.txt' 
dst_file = 'test_copy.txt' 

def cb(file_size): 
    print("Copied: {}\n".format(file_size)) 

def copyfileobj(fsrc, fdst, callback, length=8*1024): 
    copied = 0 
    while True: 
     buff = fsrc.read(length) 
     if not buff: 
      break 
     fdst.write(buff) 
     copied += len(buff) 
     callback(copied) 

t = Thread(target=copyfileobj, args=[src_file, dst_file, cb]).start() 

進步當我運行此我得到：

buf = fsrc.read(length) AttributeError: 'str' object has no attribute 'read'

我應該如何作出這樣的fsrc已經閱讀屬性？

Answer 1

你在混合文件名稱和文件句柄。

你必須open使用文件名來獲取文件句柄的文件，這兩個文件都用於讀取&。

def copyfileobj(fsrc, fdst, callback, length=8*1024): 
    copied = 0 
    with open(fsrc,"rb") as fr, open(fdst,"wb") as fw: 
     while True: 
     buff = fr.read(length) 
     if not buff: 
      break 
     fw.write(buff) 
     copied += len(buff) 
     callback(copied)