I want one backslash - not two

Question

I have a string that after print is like this: \\x4d\\xff\\xfd\\x00\\x02\\x8f\\x0e\\x80\\x66\\x48\\x71

But I want to change this string to "\\x4d\\xff\\xfd\\x00\\x02\\x8f\\x0e\\x80\\x66\\x48\\x71" which is not printable (it is necessary to write to serial port). I know that it ist problem with ' \\ '. how can I replace this printable backslashes to unprintable?

Answer 1

如果要解码字符串，请使用带有'string_escape'作为参数的decode() ，它将变量中的文字解释为python文字字符串（就像在代码中键入为常量字符串一样）。

mystr.decode('string_escape')

Answer 2

Use decode() :

>>> st = r'\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71'
>>> print st
\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71
>>> print st.decode('string-escape')
MÿýfHq

That last garbage is what my Python prints when trying to print your unprintable string.

Answer 3

You are confusing the printable representation of a string literal with the string itself:

>>> c = '\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71'
>>> c
'M\xff\xfd\x00\x02\x8f\x0e\x80fHq'
>>> len(c)
11
>>> len('\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71')
11
>>> len(r'\x4d\xff\xfd\x00\x02\x8f\x0e\x80\x66\x48\x71')
44

Answer 4

your_string.decode('string_escape')