Is this the cleanest way to write a list to a file, since
writelines() doesn't insert newline characters?
file.writelines(["%s\n" % item for item in list])
It seems like there would be a standard way...
You can use a loop:
with open('your_file.txt', 'w') as f: for item in my_list: f.write("%s\n" % item)
In Python 2, you can also use
with open('your_file.txt', 'w') as f: for item in my_list: print >> f, item
If you're keen on a single function call, at least remove the square brackets
, so that the strings to be printed get made one at a time (a genexp rather than a listcomp) -- no reason to take up all the memory required to materialize the whole list of strings.
What are you going to do with the file? Does this file exist for humans, or other programs with clear interoperability requirements?
If you are just trying to serialize a list to disk for later use by the same python app, you should be pickleing the list.
import pickle with open('outfile', 'wb') as fp: pickle.dump(itemlist, fp)
To read it back:
with open ('outfile', 'rb') as fp: itemlist = pickle.load(fp)