line source

+  #!/usr/bin/env python
   
-       1 #!/usr/bin/env python
-       2 
-       3 """Fun with generators. Corresponding Haskell implementation:
-       4 
-       5 primes = 2 : sieve [3, 5..]
-       6     where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]
-       7 """
-       8 
-       9 from itertools import dropwhile, ifilter, islice, count, chain
-      10 
-      11 def primes():
-      12     """Generate all primes."""
-      13     def sieve(ns):
-      14         p = ns.next()
-      15         # It is important to yield *here* in order to stop the
-      16         # infinite recursion.
-      17         yield p
-      18         ns = ifilter(lambda n: n % p != 0, ns)
-      19         for n in sieve(ns):
-      20             yield n
-      21 
-      22     odds = ifilter(lambda i: i % 2 == 1, count())
-      23     return chain([2], sieve(dropwhile(lambda n: n < 3, odds)))
-      24 
-      25 if __name__ == "__main__":
-      26     import sys
-      27     try:
-      28         n = int(sys.argv[1])
-      29     except (ValueError, IndexError):
-      30         n = 10
-      31     p = primes()
-      32     print "The first %d primes: %s" % (n, list(islice(p, n)))
+  """Fun with generators. Corresponding Haskell implementation:
+  
+  primes = 2 : sieve [3, 5..]
+      where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]
+  """
+  
+  from itertools import dropwhile, ifilter, islice, count, chain
+  
+  def primes():
+  """Generate all primes."""
+  def sieve(ns):
+  p = ns.next()
+  # It is important to yield *here* in order to stop the
+  # infinite recursion.
+  yield p
+  ns = ifilter(lambda n: n % p != 0, ns)
+  for n in sieve(ns):
+  yield n
+  
+  odds = ifilter(lambda i: i % 2 == 1, count())
+  return chain([2], sieve(dropwhile(lambda n: n < 3, odds)))
+  
+  if __name__ == "__main__":
+  import sys
+  try:
+  n = int(sys.argv[1])
+  except (ValueError, IndexError):
+  n = 10
+  p = primes()
+  print "The first %d primes: %s" % (n, list(islice(p, n)))

' + > | grep -A 1 '

'
   >     echo % errors encountered
   >     cat errors.log
   > }
   $ hgserveget euc-jp eucjp.txt
   % HGENCODING=euc-jp hg serve
   % hgweb filerevision, html
-       1 \xb5\xfe (esc)
+  +  \xb5\xfe (esc)
   % errors encountered
   $ hgserveget utf-8 eucjp.txt
   % HGENCODING=utf-8 hg serve
   % hgweb filerevision, html
-       1 \xef\xbf\xbd\xef\xbf\xbd (esc)
+  +  \xef\xbf\xbd\xef\xbf\xbd (esc)
   % errors encountered
   $ hgserveget us-ascii eucjp.txt
   % HGENCODING=us-ascii hg serve
   % hgweb filerevision, html
-       1 ??
+  +  ??
   % errors encountered
 
   $ cd ..