read-only character buffer, list

[aaron]

Ths following message is from a previous question.....my question is what if 
l = [0,1,2,3,4] is not a sequence...for example l=[.2,.009,.008,.05]
how do I handle this?

>>> l=[0,1,2,3,4] 
>>> f=open('e', 'w')
 >>> f.write(l) 
Traceback (most recent call last): 
File "<stdin>", line 1, in ? 
TypeError: read-only character buffer, list 

One could, of course, do the below: 
>>> l = [0,1,2,3,4] 
>>> f = open('e','w') 
>>> f.write(''.join(map(str,l)))