blocks|key|1041717|text|有趣的是，字节序列似乎不支持.format()；正如您所演示的那样。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1041718|您可以按照这里的建议使用.join()：http://bugs.python.org/issue3982|1041719|b",+".join([b'1',+b'2',+b'3'])|code-block|syntax|javascript|1041720|与使用.format()相比，.join()有一个速度上的优势，BDFL自己展示了：http://bugs.python.org/msg180449|1041721|entityMap|0|LINK|mutability|MUTABLE|url|http://bugs.python.org/issue3982|1|http://bugs.python.org/msg180449^0|E|9|0|C|7|K|W|0|0|0|3|9|F|7|16|W|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@$9|14|A|15|1|16]]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|O|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

Interestingly <code>.format()</code> doesn't appear to be supported for byte-sequences; as you have demonstrated. 

You could use <code>.join()</code> as suggested here: <a href="http://bugs.python.org/issue3982" rel="noreferrer">http://bugs.python.org/issue3982</a>

<pre><code>b", ".join([b'1', b'2', b'3'])
</code></pre>

There is a speed advantage associated with <code>.join()</code> over using <code>.format()</code> shown by the BDFL himself: <a href="http://bugs.python.org/msg180449" rel="noreferrer">http://bugs.python.org/msg180449</a>

blocks|key|5915055|text|另一种方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5915056|"{0},+{1},+{2}".format(1,+2,+3).encode()|code-block|syntax|javascript|5915057|在IPython+1.1.0和Python3.2.3上测试|5915058|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Another way would be:

<pre><code>"{0}, {1}, {2}".format(1, 2, 3).encode()
</code></pre>

Tested on IPython 1.1.0 &amp; Python 3.2.3

blocks|key|1045386|text|从Python3.5开始，%25格式化也将适用于bytes！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1045387|这是PEP+461的一部分，由伊桑·福尔曼撰写：|1045388|PEP:+461
Title:+Adding+%25+formatting+to+bytes+and+bytearray
Version:+$Revision$
Last-Modified:+$Date$
Author:+Ethan+Furman+<ethan+at+stoneleaf.us>
Status:+Draft
Type:+Standards+Track
Content-Type:+text/x-rst
Created:+2014-01-13
Python-Version:+3.5
Post-History:+2014-01-14,+2014-01-15,+2014-01-17,+2014-02-22,+2014-03-25,
+++++++++++++++2014-03-27
Resolution:


Abstract
========

This+PEP+proposes+adding+%25+formatting+operations+similar+to+Python+2's+``str``
type+to+``bytes``+and+``bytearray``+[1]_+[2]_.


Rationale
=========

While+interpolation+is+usually+thought+of+as+a+string+operation,+there+are
cases+where+interpolation+on+``bytes``+or+``bytearrays``+make+sense,+and+the
work+needed+to+make+up+for+this+missing+functionality+detracts+from+the+overall
readability+of+the+code.


Motivation
==========

With+Python+3+and+the+split+between+``str``+and+``bytes``,+one+small+but
important+area+of+programming+became+slightly+more+difficult,+and+much+more
painful+--+wire+format+protocols+[3]_.

This+area+of+programming+is+characterized+by+a+mixture+of+binary+data+and
ASCII+compatible+segments+of+text+(aka+ASCII-encoded+text).++Bringing+back+a
restricted+%25-interpolation+for+``bytes``+and+``bytearray``+will+aid+both+in
writing+new+wire+format+code,+and+in+porting+Python+2+wire+format+code.

Common+use-cases+include+``dbf``+and+``pdf``+file+formats,+``email``
formats,+and+``FTP``+and+``HTTP``+communications,+among+many+others.|code-block|syntax|javascript|1045389|PEP461是accepted+by+Guido+van+Rossum+on+March+27,+2014|1045390|1045391|已接受。恭喜组织了另一场相当有争议的讨论，并容忍了我在最后一分钟的笨拙！|blockquote|1045392|1045393|1045394|由此，我们可以明显地得出结论，%25不再计划被弃用(正如在Python3.1中宣布的那样)。|1045395|entityMap|0|LINK|mutability|MUTABLE|url|https://mail.python.org/pipermail/python-dev/2014-March/133620.html|1|https://mail.python.org/pipermail/python-dev/2014-March/133621.html^0|D|1|M|5|0|2|7|0|0|0|7|1A|1|0|0|0|0|0|F|1|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|H|3|I|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|O|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1L|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]]]

As of Python 3.5, <code>%</code> formatting will work for <code>bytes</code>, too!
This was part of <a href="https://mail.python.org/pipermail/python-dev/2014-March/133620.html" rel="nofollow noreferrer">PEP 461</a>, authored by Ethan Furman:
<pre class="lang-none prettyprint-override"><code>PEP: 461
Title: Adding % formatting to bytes and bytearray
Version: $Revision$
Last-Modified: $Date$
Author: Ethan Furman &lt;ethan at stoneleaf.us&gt;
Status: Draft
Type: Standards Track
Content-Type: text/x-rst
Created: 2014-01-13
Python-Version: 3.5
Post-History: 2014-01-14, 2014-01-15, 2014-01-17, 2014-02-22, 2014-03-25,
 2014-03-27
Resolution:


Abstract
========

This PEP proposes adding % formatting operations similar to Python 2's ``str``
type to ``bytes`` and ``bytearray`` [1]_ [2]_.


Rationale
=========

While interpolation is usually thought of as a string operation, there are
cases where interpolation on ``bytes`` or ``bytearrays`` make sense, and the
work needed to make up for this missing functionality detracts from the overall
readability of the code.


Motivation
==========

With Python 3 and the split between ``str`` and ``bytes``, one small but
important area of programming became slightly more difficult, and much more
painful -- wire format protocols [3]_.

This area of programming is characterized by a mixture of binary data and
ASCII compatible segments of text (aka ASCII-encoded text). Bringing back a
restricted %-interpolation for ``bytes`` and ``bytearray`` will aid both in
writing new wire format code, and in porting Python 2 wire format code.

Common use-cases include ``dbf`` and ``pdf`` file formats, ``email``
formats, and ``FTP`` and ``HTTP`` communications, among many others.
</code></pre>
PEP 461 was <a href="https://mail.python.org/pipermail/python-dev/2014-March/133621.html" rel="nofollow noreferrer">accepted by Guido van Rossum on March 27, 2014</a>:
<blockquote>
Accepted. Congrats with marshalling yet another quite contentious
discussion, and putting up with my last-minute block-headedness!
</blockquote>
From this, we can obviously conclude that <code>%</code> is no longer scheduled for deprecation (as was announced with Python 3.1).

blocks|key|2562789|text|我发现%25b在Python3.6.2中工作得最好，它应该同时适用于b"“和""：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2562790|print(b"Some+stuff+%25b.+Some+other+stuff"+%25+my_byte_or_unicode_string)|code-block|syntax|javascript|2562791|entityMap^0|3|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I found the <code>%b</code> working best in Python 3.6.2, it should work both for b"" and "":

<pre><code>print(b"Some stuff %b. Some other stuff" % my_byte_or_unicode_string)
</code></pre>

blocks|key|2562800|text|我发现这是可行的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2562801|a+=+"{0},+{1},+{2}".format(1,+2,+3)

b+=+bytes(a,+encoding="ascii")

>>>+b
b'1,+2,+3'|code-block|syntax|javascript|2562802|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've found this to work.

<pre><code>a = "{0}, {1}, {2}".format(1, 2, 3)

b = bytes(a, encoding="ascii")

&gt;&gt;&gt; b
b'1, 2, 3'
</code></pre>

blocks|key|1045435|text|对于Python+3.6%2B，您可以使用以下简洁的语法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1045436|f'foo+{bar}'.encode()+#+a+byte+string|code-block|syntax|javascript|1045437|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For Python 3.6+ you can use this nice and clean syntax:
<pre><code>f'foo {bar}'.encode() # a byte string
</code></pre>

blocks|key|438416|text|B%7C“您好{0}!".format("World")|type|unstyled|depth|inlineStyleRanges|entityRanges|data|438417|#!/usr/bin/env+python3.9
#+-*-+coding:+utf-8+-*-

import+builtins


class+bytes(bytes):
++++def+format(self,+*args,+encoding:+str+=+"utf-8")+->+builtins.bytes:
++++++++return_value:+bytes+=+self

++++++++for+arg,+i+in+zip(args,+range(len(args))):
++++++++++++pattern:+bytes+=+f"{i}".encode(encoding=encoding)
++++++++++++return_value+=+return_value.replace(pattern,+bytes(arg,+encoding=encoding))

++++++++return+return_value

++++def+__or__(self,+other):
++++++++return+bytes(self+%2B+bytes(other,+encoding="utf-8"))


b+=+bytes('',+encoding="utf-8")


if+__name__+==+'__main__':+++
++++print(+b%7C"Hello+{0}+{1}".format("World",+"!")+)|code-block|syntax|javascript|438418|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<h1>b|&quot;Hello {0}!&quot;.format(&quot;World&quot;)</h1>
<pre><code>#!/usr/bin/env python3.9
# -*- coding: utf-8 -*-

import builtins


class bytes(bytes):
 def format(self, *args, encoding: str = &quot;utf-8&quot;) -&gt; builtins.bytes:
 return_value: bytes = self

 for arg, i in zip(args, range(len(args))):
 pattern: bytes = f&quot;{i}&quot;.encode(encoding=encoding)
 return_value = return_value.replace(pattern, bytes(arg, encoding=encoding))

 return return_value

 def __or__(self, other):
 return bytes(self + bytes(other, encoding=&quot;utf-8&quot;))


b = bytes('', encoding=&quot;utf-8&quot;)


if __name__ == '__main__': 
 print( b|&quot;Hello {0} {1}&quot;.format(&quot;World&quot;, &quot;!&quot;) )
</code></pre>

In Python 3, one can format a string like:

<pre><code>"{0}, {1}, {2}".format(1, 2, 3)
</code></pre>

But how to format bytes?

<pre><code>b"{0}, {1}, {2}".format(1, 2, 3)
</code></pre>

raises <code>AttributeError: 'bytes' object has no attribute 'format'</code>.

If there is no <code>format</code> method for bytes, how to do the formatting or "rewriting" of bytes?

Python 3 bytes formatting

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Python 3中，可以格式化字符串，如下所示："{0}, {1}, {2}".format(1, 2, 3)但是如何格式化字节呢？b"{0}, {1}, {2}".format(1, 2, 3)引发AttributeError: 'bytes' object has no attribute 'format'。如果...

问Python 3字节格式
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