如何一次使用多个字符串文字

Question

我有一个字节串，我想在 re:

中使用

user_name = 'Simon'
string = 'Hello {user_name}, nice to see you! :)'

然而，除了使用字节之外，re 字符串还应该是原始字符串 (r)。

那么如何同时指定字节、f 字符串和原始字符串？

我试过了：

user_name = rb'Simon'
string = brf'Hello {user_name}, nice to see you! :)'

但是：

In [1]: user_name = rb'Simon'
   ...: string = brf'Hello {user_name}, nice to see you! :)'
  File "<ipython-input-8-93fb315cc66f>", line 2
    string = brf'Hello {user_name}, nice to see you! :)'
                                                       ^
SyntaxError: invalid syntax


In [2]:

我也试过 format() 但失败了：

In [2]: string = br'Hello {}, nice to see you! :)'.format(user_name)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-9-36faa39ba31d> in <module>()
----> 1 string = br'Hello {}, nice to see you! :)'.format(user_name)

AttributeError: 'bytes' object has no attribute 'format'

In [3]:

如何指定多个字符串文字？

Answer 1

字符串插值仅限于 strings，不能用于 bytes。这是地址 in the PEP:

For the same reason that we don't support bytes.format(), you may not combine 'f' with 'b' string literals. The primary problem is that an object's __format__() method may return Unicode data that is not compatible with a bytes string.

解决方法是手动将字符串编码为字节：

>>> rf'Hello {user_name}, nice to see you! :)'.encode()
b'Hello Simon, nice to see you! :)'

如何一次使用多个字符串文字

How to use multiple string literals at once

python

string

byte

rawstring