python - 如何将转义序列传递给 python 的 ord() 函数？

Question

我正在使用 Python 3。我还在脚本中使用了 ord() 函数。如果我ord('\xff')在控制台中输入它会返回255

有没有办法在不获取的情况下将\xff（存储在变量中）插入到ord()函数中

error:
TypeError: ord() expected a character, but string of length 4 found

如何ord('\xff')工作？ord() 不读取字符串？那它在读什么？

Answer 1

Are you receiving this data from some user input? In this case, what you meant to read as a single character was read literally as a string of size 4.

In [1320]: v = input()
\xff

In [1321]: v
Out[1321]: '\\xff'

One workaround is to use ast.literal_eval:

In [1326]: import ast

In [1327]: v = ast.literal_eval('"{}"'.format(v))

In [1329]: ord(v)
Out[1329]: 255