python - Error in writing a dictionary to a file -

i trying write dictionary invindex text file. found following post:

and wrote these lines:

import csv f = open('result.csv','wb') w = csv.dictwriter(f,invindex) w.writerow(invindex) f.close() 

when reach line: w.writerow(invindex), error:

traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "c:\python33\lib\csv.py", line 153, in writerow     return self.writer.writerow(self._dict_to_list(rowdict)) typeerror: 'str' not support buffer interface 

how can write dictionary text file correctly.

in python 3, csv writers , readers expect text stream, open(.., 'wb') (or more precisely, b creates byte stream). try:

import csv invindex = [   {'fruit': 'apple',  'count': '10'},   {'fruit': 'banana', 'count': '42'}] open('result.csv', 'w', encoding='utf-8') f:     w = csv.dictwriter(f, invindex[0].keys())     w.writeheader()     w.writerows(invindex) 

replace utf-8 encoding want use. write file like

fruit,count apple,10 banana,42