python - csv.DictWriter delimiter set to space implies text in " " -

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hi noticed while using dictwriter , delimiter=' ' instead of ',' string saved file in "" while use of comma without. how set things have strings without " "?

code

import csv golds_two =[] mydict ={}  open ('filea.csv','ru') csvfile:     wszystkie=csv.dictreader(csvfile,delimiter=',')     w in wszystkie:         mydict[(w['url']).split('/')[-1]]=w['mediaobject id']   open ('fileb.csv','ru') csvfile:     golds=csv.dictreader(csvfile,delimiter=';')     g in golds:         g['mediaobject id']=mydict[g['id']]         golds_two.append(g)   open('filec.csv','w') f:          head_fields =golds_two[0].keys()         head_fields.remove('id')         print head_fields         head_fields=sorted(head_fields,reverse=true)         csvdw = csv.dictwriter(f,delimiter=" ",fieldnames=head_fields)         headers = dict( (n,n) n in head_fields)          z in golds_two:             z.pop('id',none)             print z             csvdw.writerow(z)

filea.csv:

mediaobject id,url 1152901,http://foo.bar/tru716565.jpg 1152902,http://foo.bar/tru716566.jpg

fileb.csv:

id;gold label tru716565.jpg;identifable x tru716566.jpg;non identfiable x

resulting filec.csv:

1152901 "identifable x" 1152902 "non identfiable x"

normally, suppress quoting of data fields in csv file need add aquoting=csv.quote_nonekeyword argument csv.dictwriter()constructor call.

however, doing in case cause exception raised because of data fields contain thedemilitercharacter trying use (' '), , differentescapecharwas not defined. mentioned in documentation says:

if escapechar not set, writer raise error if characters require escaping encountered.

this makes total sense if think -- csv file unparsable (i.e. invalid) if data in fields contained unescaped delimiter characters because there no way tell data delimiters -- they'd non-identifiable -- if results looked this:

1152901 identifable x 1152902 non identfiable x

so changing delimiter to"\t"will rid of quotes (as discovered), or alternatively define anescapechar="\\"(or whatever) in constructor call , leave delimiter set to" "-- because either there no longer conflict between file's delimiter , contents of data fields or there way escape them when they're encountered.

if want results way stated unknown reason, can write file out manually, suppose.

update: here's 1 possible workaround changes space characters in data fields to'\xa0' non-breaking space on system displays same regular space character.

with open('filec.csv','w') f:     head_fields =golds_two[0].keys()     head_fields.remove('id')     print head_fields     head_fields=sorted(head_fields,reverse=true)     csvdw = csv.dictwriter(f,delimiter=" ",fieldnames=head_fields,                            quoting=csv.quote_none)     headers = dict( (n,n) n in head_fields)      z in golds_two:         z.pop('id',none)         print z         k,v in z.iteritems():             z[k] = v.replace(' ', '\xa0')         csvdw.writerow(z)

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