How to convert list into a string?

Question

I have extracted some data from the file and want to write it in the file 2 but the program says 'sequence item 1: expected string, list found', I want to know how I can convert buffer[] i.e. string into sequence, so that it could be saved in file 2.

file = open('/ddfs/user/data/k/ktrip_01/hmm.txt','r')
file2 = open('/ddfs/user/data/k/ktrip_01/hmm_write.txt','w')
buffer = []
rec = file.readlines()
for line in rec :
        field = line.split()
        print '>',field[0]
        term = field[0]
        buffer.append(term)
        print   field[1], field[2],   field[6], field[12]
        term1 = field [1]
        buffer.append(term1)
        term2 = field[2]
        buffer.append[term2]
        term3 = field[6]
        buffer.append[term3]
        term4 = field[12]
        buffer.append[term4]
        file2.write(buffer)
file.close()
file2.close()

Answer 1

''.join(buffer)

Answer 2

Try str.join:

file2.write(' '.join(buffer))

Documentation says:

Return a string which is the concatenation of the strings in the iterable iterable. The separator between elements is the string providing this method.

Answer 3

file2.write(','.join(buffer))