Someone

#!/usr/bin/python
#site.org/a/dir01/dir01_file01.log
import os
site="site.org/"
filename="_filename"
dir="directory"
dir1_range="abcdefghij"#klmnopqrstuvwxyz"
for x in dir1_range:
	for z in range(1,16):
		z=str(z)
		if len(z)==1:
			z="0"+z
		for f in range(1,41):
			f=str(f)
			if len(f)==1:
				f="0"+f
			var= site+x+"/"+dir+str(z)+"/"+dir+str(z)+filename+str(f)+".log"
#			print var
			print ("wget "+var)