Jason Qian via Python-list wrote:
> HI
>
> I have a string that contains \r\n\t
>
> [Ljava.lang.Object; does not exist*\r\n\t*at
> [com.livecluster.core.tasklet
>
>
> I would like to print it as :
>
> [Ljava.lang.Object; does not exist
> tat com.livecluster.core.tasklet
>
> How can I do this in python print ?
Assuming the string contains the escape sequences rather than an actual
TAB, CR or NL you can apply codecs.decode():
>>> s = r"[Ljava.lang.Object; does not exist\r\n\tat
com.livecluster.core.tasklet"
>>> print(s)
[Ljava.lang.Object; does not exist\r\n\tat com.livecluster.core.tasklet
>>> import codecs
>>> print(codecs.decode(s, "unicode-escape"))
[Ljava.lang.Object; does not exist
at com.livecluster.core.tasklet
Note that this will decode all escape sequences that may occur in a string
literal
in Python, e. g.
>>> codecs.decode(r"\x09 \u03c0 \N{soft ice cream}", "unicode-escape")
'\t π 🍦'
and will complain when the string is not a valid Python string literal:
>>> codecs.decode(r"\x", "unicode-escape")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'unicodeescape' codec can't decode bytes in position
0-1: truncated \xXX escape
If you need more control you can build your own conversion routine:
import re
lookup = {
"r": "\r",
"n": "\n",
"t": "\t",
}
def substitute(match):
group = match.group(1)
return lookup.get(group, group)
def decode(s):
return re.sub(r"\\(.)", substitute, s)
s = decode("alpha\\n \\xomega\\\\")
print(s)
print(repr(s))
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