Merged revisions 81053,81259,81265 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81053 | florent.xicluna | 2010-05-10 21:59:22 +0200 (lun., 10 mai 2010) | 2 lines

  Add a link on maketrans().
........
  r81259 | florent.xicluna | 2010-05-17 12:39:07 +0200 (lun., 17 mai 2010) | 2 lines

  Slight style cleanup.
........
  r81265 | florent.xicluna | 2010-05-17 15:35:09 +0200 (lun., 17 mai 2010) | 2 lines

  Issue #1285086: Speed up urllib.quote and urllib.unquote for simple cases.
........

Doc/library/stdtypes.rst

@@ -1186,9 +1186,9 @@ string functions based on regular expressions.
    mapped through the given translation table, which must be a string of length
    256.
 
-   You can use the :func:`maketrans` helper function in the :mod:`string` module to
-   create a translation table. For string objects, set the *table* argument to
-   ``None`` for translations that only delete characters:
+   You can use the :func:`~string.maketrans` helper function in the :mod:`string`
+   module to create a translation table. For string objects, set the *table*
+   argument to ``None`` for translations that only delete characters:
 
       >>> 'read this short text'.translate(None, 'aeiou')
       'rd ths shrt txt'

Lib/urllib.py

@@ -94,6 +94,8 @@ def urlretrieve(url, filename=None, reporthook=None, data=None):
 def urlcleanup():
     if _urlopener:
         _urlopener.cleanup()
+    _safe_quoters.clear()
+    ftpcache.clear()
 
 # check for SSL
 try:
@@ -771,7 +773,7 @@ class FancyURLopener(URLopener):
         else:
             return self.open(newurl, data)
 
-    def get_user_passwd(self, host, realm, clear_cache = 0):
+    def get_user_passwd(self, host, realm, clear_cache=0):
         key = realm + '@' + host.lower()
         if key in self.auth_cache:
             if clear_cache:
@@ -1163,20 +1165,24 @@ def splitvalue(attr):
     return attr, None
 
 _hexdig = '0123456789ABCDEFabcdef'
-_hextochr = dict((a+b, chr(int(a+b,16))) for a in _hexdig for b in _hexdig)
+_hextochr = dict((a + b, chr(int(a + b, 16)))
+                 for a in _hexdig for b in _hexdig)
 
 def unquote(s):
     """unquote('abc%20def') -> 'abc def'."""
     res = s.split('%')
-    for i in xrange(1, len(res)):
-        item = res[i]
+    # fastpath
+    if len(res) == 1:
+        return s
+    s = res[0]
+    for item in res[1:]:
         try:
-            res[i] = _hextochr[item[:2]] + item[2:]
+            s += _hextochr[item[:2]] + item[2:]
         except KeyError:
-            res[i] = '%' + item
+            s += '%' + item
         except UnicodeDecodeError:
-            res[i] = unichr(int(item[:2], 16)) + item[2:]
-    return "".join(res)
+            s += unichr(int(item[:2], 16)) + item[2:]
+    return s
 
 def unquote_plus(s):
     """unquote('%7e/abc+def') -> '~/abc def'"""
@@ -1186,9 +1192,12 @@ def unquote_plus(s):
 always_safe = ('ABCDEFGHIJKLMNOPQRSTUVWXYZ'
                'abcdefghijklmnopqrstuvwxyz'
                '0123456789' '_.-')
-_safemaps = {}
+_safe_map = {}
+for i, c in zip(xrange(256), str(bytearray(xrange(256)))):
+    _safe_map[c] = c if (i < 128 and c in always_safe) else '%{0:02X}'.format(i)
+_safe_quoters = {}
 
-def quote(s, safe = '/'):
+def quote(s, safe='/'):
     """quote('abc def') -> 'abc%20def'
 
     Each part of a URL, e.g. the path info, the query, etc., has a
@@ -1209,27 +1218,30 @@ def quote(s, safe = '/'):
     called on a path where the existing slash characters are used as
     reserved characters.
     """
+    # fastpath
+    if not s:
+        return s
     cachekey = (safe, always_safe)
     try:
-        safe_map = _safemaps[cachekey]
+        (quoter, safe) = _safe_quoters[cachekey]
     except KeyError:
-        safe += always_safe
-        safe_map = {}
-        for i in range(256):
-            c = chr(i)
-            safe_map[c] = (c in safe) and c or ('%%%02X' % i)
-        _safemaps[cachekey] = safe_map
-    res = map(safe_map.__getitem__, s)
-    return ''.join(res)
-
-def quote_plus(s, safe = ''):
+        safe_map = _safe_map.copy()
+        safe_map.update([(c, c) for c in safe])
+        quoter = safe_map.__getitem__
+        safe = always_safe + safe
+        _safe_quoters[cachekey] = (quoter, safe)
+    if not s.rstrip(safe):
+        return s
+    return ''.join(map(quoter, s))
+
+def quote_plus(s, safe=''):
     """Quote the query fragment of a URL; replacing ' ' with '+'"""
     if ' ' in s:
         s = quote(s, safe + ' ')
         return s.replace(' ', '+')
     return quote(s, safe)
 
-def urlencode(query,doseq=0):
+def urlencode(query, doseq=0):
     """Encode a sequence of two-element tuples or dictionary into a URL query string.
 
     If any values in the query arg are sequences and doseq is true, each
@@ -1391,7 +1403,6 @@ if sys.platform == 'darwin':
 
         return False
 
-
     def getproxies_macosx_sysconf():
         """Return a dictionary of scheme -> proxy server URL mappings.
 
@@ -1400,8 +1411,6 @@ if sys.platform == 'darwin':
         """
         return _get_proxies()
 
-
-
     def proxy_bypass(host):
         if getproxies_environment():
             return proxy_bypass_environment(host)

Misc/NEWS

@@ -12,6 +12,8 @@ What's New in Python 2.6.6?
 Library
 -------
 
+- Issue #1285086: Speed up urllib.quote and urllib.unquote for simple cases.
+
 - Issue #5798: Handle select.poll flag oddities properly on OS X.
   This fixes test_asynchat and test_smtplib failures on OS X.