Python如何写入二进制文件? [英] Python how to write to a binary file?

问题描述

我有一个作为整数的字节列表，类似于

[120, 3, 255, 0, 100]

如何将此列表作为二进制文件写入文件?

这行得通吗?

newFileBytes = [123, 3, 255, 0, 100]#制作文件newFile = open("文件名.txt", "wb")# 写入文件newFile.write(newFileBytes)

解决方案

这正是 bytearray 用于:

newFileByteArray = bytearray(newFileBytes)newFile.write(newFileByteArray)

如果您使用的是 Python 3.x，则可以使用 bytes 代替(并且可能应该这样做，因为它可以更好地表明您的意图).但是在 Python 2.x 中，这是行不通的，因为 bytes 只是 str 的别名.像往常一样，用交互式解释器显示比用文本解释更容易，所以让我这样做.

Python 3.x:

<预><代码>>>>字节数组(新文件字节)bytearray(b'{\x03\xff\x00d')>>>字节(新文件字节)b'{\x03\xff\x00d'

Python 2.x:

<预><代码>>>>字节数组(新文件字节)bytearray(b'{\x03\xff\x00d')>>>字节(新文件字节)'[123, 3, 255, 0, 100]'

I have a list of bytes as integers, which is something like

[120, 3, 255, 0, 100]

How can I write this list to a file as binary?

Would this work?

newFileBytes = [123, 3, 255, 0, 100]
# make file
newFile = open("filename.txt", "wb")
# write to file
newFile.write(newFileBytes)

解决方案

This is exactly what bytearray is for:

newFileByteArray = bytearray(newFileBytes)
newFile.write(newFileByteArray)

If you're using Python 3.x, you can use bytes instead (and probably ought to, as it signals your intention better). But in Python 2.x, that won't work, because bytes is just an alias for str. As usual, showing with the interactive interpreter is easier than explaining with text, so let me just do that.

Python 3.x:

>>> bytearray(newFileBytes)
bytearray(b'{\x03\xff\x00d')
>>> bytes(newFileBytes)
b'{\x03\xff\x00d'

Python 2.x:

>>> bytearray(newFileBytes)
bytearray(b'{\x03\xff\x00d')
>>> bytes(newFileBytes)
'[123, 3, 255, 0, 100]'

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