Konstantinos Pachopoulos wrote: > Hi, > i have the following string s and the following code, which doesn't > successfully remove the "\", but sucessfully removes the "\\". > > >>> s="Sad\\asd\asd" > >>> newS="" > >>> for i in s: > ... if i!="\\": > ... newS=newS+i > ... > >>> newS > 'Sadasd\x07sd' > In actual fact there was just a single backslash in s to start with. If you read the documentation carefully at
http://docs.python.org/ref/strings.html (though it's the language reference manual, and therefore not necessarily suitable reading for beginners) you will see that the "\\" represents a single backslash character and \a represents an ASCII BEL character (whose decimal value is 7, and which the interpreter represents as the hexadecimal escape string \x07). So the characters in s were S a d \ a s d \x07 s d and you shoudl have seen len(s) == 10. As has already been mentioned, the shortest way to do what you want would be newS = s.replace("\\", "") > I have also read the following, but i do not understand the "...and the > remaining characters have been mapped through the given translation > table, which must be a string of length 256". Can some explain? > > *translate*( table[, deletechars]) > > Return a copy of the string where all characters occurring in the > optional argument deletechars are removed, and the remaining > characters have been mapped through the given translation table, > which must be a string of length 256. > > For Unicode objects, the translate() method does not accept the > optional deletechars argument. Instead, it returns a copy of the s > where all characters have been mapped through the given translation > table which must be a mapping of Unicode ordinals to Unicode > ordinals, Unicode strings or |None|. Unmapped characters are left > untouched. Characters mapped to |None| are deleted. Note, a more > flexible approach is to create a custom character mapping codec > using the codecs <http://docs.python.org/lib/module-codecs.html> > module (see encodings.cp1251 for an example). > The translate() string method uses the numeric represetation of each character as an index into the translation table. So a null translation table can be constructed using >>> t = "".join(chr(i) for i in range(256)) >>> t '\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\ x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./0123456789:;<=>[EMAIL PROTECTED] DEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83 \x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97 \x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab \xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf \xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3 \xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7 \xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb \xfc\xfd\xfe\xff' >>> (the above output will look a little screwy in the mail because of odd line wrapping). So hopefully you could then achieve the same effect (at vastly greater complexity than the first solution) using >>> s="Sad\\asd\asd" >>> len(s) 10 >>> newS = s.translate(t, "\\") >>> newS 'Sadasd\x07sd' >>> You would probably only want to use that method if you were actually translating some of the characters at the same time. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Sorry, the dog ate my .sigline -- http://mail.python.org/mailman/listinfo/python-list