def programa():
your_list = 'abcdefghijklmnopqrstuvwxyz'
complete_list = [ ]
outputname=raw_input("Inserte nombre de archivo y extension (se recomienda usar .txt) ")
myfile = open (outputname, 'w')
b=int(raw_input("Inserte cantidad maxima de caracteres "))
for current in xrange(b):
a = [i for i in your_list]
for y in xrange(current):
a = [x+i for i in your_list for x in a]
complete_list = complete_list+a
myfile.writelines(complete_list)
print complete_list
print "El archivo ", outputname, "a sido guardado"
programa()