Python 3 字节格式
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Python 3 bytes formatting
提问by Ecir Hana
In Python 3, one can format a string like:
在 Python 3 中，可以格式化字符串，如：
"{0}, {1}, {2}".format(1, 2, 3)
But how to format bytes?
但是如何格式化字节？
b"{0}, {1}, {2}".format(1, 2, 3)
raises AttributeError: 'bytes' object has no attribute 'format'.
提高AttributeError: 'bytes' object has no attribute 'format'。
If there is no formatmethod for bytes, how to do the formatting or "rewriting" of bytes?
如果没有format字节的方法，如何对字节进行格式化或“重写”？
采纳答案by Ecir Hana
And as of 3.5 %formatting will work for bytes, too!
从 3.5%格式开始，也适用于bytes！
https://mail.python.org/pipermail/python-dev/2014-March/133621.html
https://mail.python.org/pipermail/python-dev/2014-March/133621.html
回答by mechanical_meat
Interestingly .format()doesn't appear to be supported for byte-sequences; as you have demonstrated.
有趣的是.format()似乎不支持字节序列；正如你所展示的。
You could use .join()as suggested here: http://bugs.python.org/issue3982
您可以.join()按照此处的建议使用：http: //bugs.python.org/issue3982
b", ".join([b'1', b'2', b'3'])
There is a speed advantage associated with .join()over using .format()shown by the BDFL himself: http://bugs.python.org/msg180449
BDFL 本人展示了与.join()过度使用相关的速度优势.format()：http://bugs.python.org/msg180449
回答by Schcriher
Another way would be:
另一种方法是：
"{0}, {1}, {2}".format(1, 2, 3).encode()
Tested on IPython 1.1.0 & Python 3.2.3
在 IPython 1.1.0 和 Python 3.2.3 上测试
回答by ivan_bilan
I found the %bworking best in Python 3.6.2, it should work both for b"" and "":
我发现%b在 Python 3.6.2 中效果最好，它应该适用于 b"" 和 ""：
print(b"Some stuff %b. Some other stuff" % my_byte_or_unicode_string)
回答by binny
I've found this to work.
我发现这有效。
a = "{0}, {1}, {2}".format(1, 2, 3)
b = bytes(a, encoding="ascii")
>>> b
b'1, 2, 3'
