在 Python 中将 io.BytesIO 内容复制到文件

问题：

在 Python 中，你有一个包含某些数据的 io.BytesIO 实例。你想将该数据复制到文件（或另一个类文件对象）。

解决方案

使用此函数：

copy_filelike.py

def copy_filelike_to_filelike(src, dst, bufsize=16384):
    while True:
        buf = src.read(bufsize)
        if not buf:
            break
        dst.write(buf)

def copy_filelike_to_filelike(src, dst, bufsize=16384):
    while True:
        buf = src.read(bufsize)
        if not buf:
            break
        dst.write(buf)

用法示例：

copy_bytesio_example.py

import io

myBytesIO = io.BytesIO(b"test123")

with open("myfile.txt", "wb") as outfile:
    copy_filelike_to_filelike(myBytesIO, outfile)
# myfile.txt 现在包含 "test123"（没有尾随换行符）

import io

myBytesIO = io.BytesIO(b"test123")

with open("myfile.txt", "wb") as outfile:
    copy_filelike_to_filelike(myBytesIO, outfile)
# myfile.txt 现在包含 "test123"（没有尾随换行符）

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