Python compat - urllib

[michaelplatings]

LGTM

llvm/trunk/utils/unicode-case-fold.py

 Right now this generates a function which implements simple case folding (C+S
 entries).
 """
 
 from __future__ import print_function
 
 import sys
 import re
-import urllib2
+try:
+    from urllib.request import urlopen
+except ImportError:
+    from urllib2 import urlopen
+
 
 # This variable will body of the mappings function
 body = ""
 
 # Reads file line-by-line, extracts Common and Simple case fold mappings and
 # returns a (from_char, to_char, from_name) tuple.
 def mappings(f):
     previous_from = -1
def dump_block(b):
     elif stride(b) == 1:
         # Another special case: X % 1 is always zero, so don't emit the
         # modulo-check.
         pattern = "  if (C <= {0:#06x})\n    return C + {3};\n"
 
     body += pattern.format(last, stride(b), modulo, shift(b[0]))
 
 current_block = []
-f = urllib2.urlopen(sys.argv[1])
+f = urlopen(sys.argv[1])
 for m in mappings(f):
     if len(current_block) == 0:
         current_block.append(m)
         continue
 
     if shift(current_block[0]) != shift(m):
         # Incompatible shift, start a new block.
         dump_block(current_block)