Had two answers and some comments, mentioned another question, but all had not provided REASON, why Python did this changes? such as '/b' is '/x08' is just the result, but why? Cheers.
I try to add this path"F:\big data\Python_coding\diveintopython-5.4\py" into sys.path, therefore, the code under it could be imported directly.
after using : sys.path.append('F:\big data\Python_coding\diveintopython-5.4\py')
I found I had this path inside sys.path: 'F:\x08ig data\Python_coding\diveintopython-5.4\py'
I then tested using the following code:mypath1='F:\big data\bython_coding\aiveintopython-5.4\ry'
the mypath1 now is : 'F:\x08ig data\x08ython_coding\x07iveintopython-5.4\ry'
all the '\b' changed into '\x08' and '\a' changed into '\x07'
I searched for a while, but still can not find the reason, could you please check it out and any feedback or help will be appropriated. Many thanks.
\r – the carriage return. \x0b – the vertical tab. It can be also expressed as \v . \x0c – the form feed character that forces a printer to move the next sheet of paper. It's also expressed as \f .
Strings are Arrays Like many other popular programming languages, strings in Python are arrays of bytes representing unicode characters. However, Python does not have a character data type, a single character is simply a string with a length of 1. Square brackets can be used to access elements of the string.
How to create a string in Python? Strings can be created by enclosing characters inside a single quote or double-quotes. Even triple quotes can be used in Python but generally used to represent multiline strings and docstrings.
Your strings are being escaped. Check out the docs on string literals:
The backslash () character is used to escape characters that otherwise have a special meaning, such as newline, backslash itself, or the quote character. String literals may optionally be prefixed with a letter
r' or
R'; such strings are called raw strings and use different rules for backslash escape sequences.
This is a historical usage dating from the early 60s. It allows you to enter characters that you're not otherwise able to enter from a standard keyboard. For example, if you type into the Python interpreter:
print "\xDC"
...you'll get Ü
. In your case, you have \b
- representing backspace - which Python displays in the \xhh
form, where hh
is the hexadecimal value for 08. \a
is the escape sequence for the ASCII bell: try print "\a"
with your sound on and you should hear a beep.
Escape sequence \a
, \b
is equivalnt to \x07
, \x08
.
>>> '\a'
'\x07'
>>> '\b'
'\x08'
You should escape \
itself to represent backslash literally:
>>> '\\a'
'\\a'
>>> '\\b'
'\\b'
or use raw string literals:
>>> r'\a'
'\\a'
>>> r'\b'
'\\b'
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