On Jan 11, 12:50 pm, teddyber <[EMAIL PROTECTED]> wrote: > Hello, > > first i'm a newbie to python (but i searched the Internet i swear). > i'm looking for some way to split up a string into a list of pairs > 'key=value'. This code should be able to handle this particular > example string : > > qop="auth,auth-int,auth-conf",cipher="rc4-40,rc4-56,rc4,des, > 3des",maxbuf=1024,charset=utf-8,algorithm=md5-sess > > i know i can do that with some regexp (i'm currently trying to learn > that) but if there's some other way... > > thanks
Those quoted strings sure are pesky when you try to split along commas. Here is a solution using pyparsing - note the argument field access methods at the bottom. Also, the parse action attached to integer will do conversion of the string to an int at parse time. More info on pyparsing at http://pyparsing.wikispaces.com. -- Paul from pyparsing import Word, nums, alphas, quotedString, \ delimitedList, Literal, CharsNotIn, Dict, Group, \ removeQuotes arg = '''qop="auth,auth-int,auth-conf", cipher="rc4-40,rc4-56,rc4,des,3des", maxbuf=1024,charset=utf-8,algorithm=md5-sess''' # format is: delimited list of key=value groups, where value is # a quoted string, an integer, or a non-quoted string up to the next # ',' character key = Word(alphas) EQ = Literal("=").suppress() integer = Word(nums).setParseAction(lambda t:int(t[0])) quotedString.setParseAction(removeQuotes) other = CharsNotIn(",") val = quotedString | integer | other # parse each key=val arg into its own group argList = delimitedList( Group(key + EQ + val) ) args = argList.parseString(arg) # print the parsed results print args.asList() print # add dict-like retrieval capabilities, by wrapping in a Dict expression argList = Dict(delimitedList( Group(key + EQ + val) )) args = argList.parseString(arg) # print the modified results, using dump() (shows dict entries too) print args.dump() # access the values by key name print "Keys =", args.keys() print "cipher =", args["cipher"] # or can access them like attributes of an object print "maxbuf =", args.maxbuf Prints: [['qop', 'auth,auth-int,auth-conf'], ['cipher', 'rc4-40,rc4-56,rc4,des, 3des'], ['maxbuf', 1024], ['charset', 'utf-8'], ['algorithm', 'md5- sess']] [['qop', 'auth,auth-int,auth-conf'], ['cipher', 'rc4-40,rc4-56,rc4,des, 3des'], ['maxbuf', 1024], ['charset', 'utf-8'], ['algorithm', 'md5- sess']] - algorithm: md5-sess - charset: utf-8 - cipher: rc4-40,rc4-56,rc4,des,3des - maxbuf: 1024 - qop: auth,auth-int,auth-conf Keys = ['maxbuf', 'cipher', 'charset', 'algorithm', 'qop'] maxbuf = 1024 cipher = rc4-40,rc4-56,rc4,des,3des -- http://mail.python.org/mailman/listinfo/python-list
