问题

为什么这不起作用？我在数据文件中删除了多余的反斜杠，但控制台中不显示Unicode字符？

import re 
file = open("arrayOfCards",'r')
while True:
    next_line = file.readline()
    if not next_line:
        break;
    d = next_line.split(',')
    print (re.sub(r'\\','',d[2]))
file.close()

card = ['A','diamonds','🃁','14']
print (type(card[2]), card[2])

file arrayOfCards:

A,diamonds,🃁,14
A,clubs,\\U0001F0D1,14

我得到以下输出:

[qw@qw project]$
🃁
\U0001F0D1
<class 'str'> 🃁

请帮忙，我解决不了这个问题。

import re 
file = open("arrayOfCards",'r')
while True:
    next_line = file.readline()
    if not next_line:
        break;
    d = next_line.split(',')
    print (re.sub(r'\'','',d[2]))
file.close()

card = ['A','diamonds','\U0001F0C1','14']
print (type(card[2]), card[2])

A,diamonds,\U0001F0C1,14
A,clubs,\\U0001F0D1,14

[qw@qw project]$
\U0001F0C1
\\U0001F0D1
<class 'str'> 🃁

答案1

得分: 0

有关Unicode和使用`\`转义字符似乎存在一些混淆：

```python
from io import StringIO
import re

f = StringIO(r"""A,diamonds,\U0001F0C1,14
A,clubs,\\U0001F0D1,14""")

for l in f.readlines():
    d = l.split(',')
    c = re.sub(r'\\\\', r'\\', d[2])      # 替换双斜杠为单斜杠（类似第2行）
    print(c.encode().decode('unicode-escape')) # 解释您的Unicode字符串，同时考虑转义的\U

card = ['A', 'diamonds', '\U0001F0C1', '14']
print(type(card[2]), card[2])

注意：如果您不需要进一步的替换，可以保留import re并将re.sub(...)替换为c = d[2].replace('\\\\', '\\')

<details>
<summary>英文:</summary>

There seems to be some confusion around unicode and escaping characters with `\`:
```python
from io import StringIO
import re

f = StringIO(r&quot;&quot;&quot;A,diamonds,\U0001F0C1,14
A,clubs,\\U0001F0D1,14&quot;&quot;&quot;)

for l in f.readlines():
    d = l.split(&#39;,&#39;)
    c = re.sub(r&#39;\\\\&#39;,r&#39;\\&#39;,d[2])      # replacing double with single slash (like in 2nd line)
    print(c.encode().decode(&#39;unicode-escape&#39;)) # interpreting your unicode string while taking escaped \U into consideration

card = [&#39;A&#39;,&#39;diamonds&#39;,&#39;\U0001F0C1&#39;,&#39;14&#39;]
print(type(card[2]), card[2])

Note: if you don't need further substitutions, you can leave import re and replace re.sub(...) with c = d[2].replace('\\\\','\\')

答案2

得分: -1

因为文件是在不执行Unicode转义的情况下读取的。您可以使用eval手动执行它们，如下所示：d[2] = eval(""'" + d[2] + "'")。您必须在字符串的开头和结尾添加引号，以使其成为一个用于评估的字符串文字。最终的代码将如下所示：

import re 
file = open("arrayOfCards",'r')
while True:
    next_line = file.readline()
    if not next_line:
        break;
    d = next_line.split(',')
    d[2] = eval("''" + d[2] + "''")
    print (re.sub(r"''",'',d[2]))
file.close()

card = ['A','diamonds','🃁','14']
print (type(card[2]), card[2])

import re 
file = open("arrayOfCards",'r')
while True:
    next_line = file.readline()
    if not next_line:
        break;
    d = next_line.split(',')
    d[2] = eval("'" + d[2] + "'")
    print (re.sub(r'\'','',d[2]))
file.close()

card = ['A','diamonds','\U0001F0C1','14']
print (type(card[2]), card[2])