[Tutor] passing arguments to functions - problem with argument order

[tetsuo2k6 at web.de]

I don't get this - what is the clean way of the order of passing 
arguments to functions?

The called function goes like this:

def csvwriter(output_csv_filename=None, *coloumn_definitions):
         """Edit Me!"""
         if output_csv_filename == None:
                 output_csv_filename = raw_input("Name der zu 
erzeugenden Datei (vollständiger Pfad)? (ACHTUNG: WIRD ÜBERSCHRIEBEN, 
FALLS VORHANDEN!) ")
         first_row = ";".join(coloumn_definitions)
         print(first_row)
         try:
                 file = open(output_csv_filename, "w")
                 file.writerow(first_row)
                 file.close()
         except Exception, e:
                 print("Konnte %s nicht zum Schreiben öffnen.")
                 sys.exit(e)
         return csv.writer(open(output_csv_filename, "ab"), 
delimiter=";", quoting=csv.QUOTE_NONE)


The call to the function seems impossible to do. When I say:

                 writer = dgf.csvwriter(output_csv_filename=None, 
"kundennummer", "anrede", "vorname", "nachname", "plz", "ort", 
"adresse", "kontoinhaber", "blz", "kto", "bankname", "status", 
"spielbeginn", "letzte_aenderung", "importdatum", "briefdatum", 
"buchungsdatum", "stornodatum")

I get:

SyntaxError: non-keyword arg after keyword arg

-> So I guess I have to put keyword arg at the end...

When I put output_csv_writer at the end:

                 writer = dgf.csvwriter("kundennummer", "anrede", 
"vorname", "nachname", "plz", "ort", "adresse", "kontoinhaber", "blz", 
"kto", "bankname", "status", "spielbeginn", "letzte_aenderung", 
"importdatum", "briefdatum", "buchungsdatum", "stornodatum", 
output_csv_filename=None)

I get:

TypeError: csvwriter() got multiple values for keyword argument 
'output_csv_filename'

-> Am I right that output_csv_filename now becomes "kundennummer" at first?



Also, changing the function definition gives me syntax error:

     def csvwriter(*coloumn_definitions, output_csv_filename=None):
                                                           ^
SyntaxError: invalid syntax



What's going on here? I'm confused...


Paul