An example would be as follows:
outfile = open('filename.txt', 'w')
for num in range (1, 11):
outfile.write(str(num) + '\n')
outfile.close()
And a second example:
dataFile = open("filename", "w")
for line in range(11):
dataFile.write("%s\n" % line)
dataFile.close()
Hope this helps.