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Diffstat (limited to 'Doc/whatsnew/2.4.rst')
| -rw-r--r-- | Doc/whatsnew/2.4.rst | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/Doc/whatsnew/2.4.rst b/Doc/whatsnew/2.4.rst index 59788ba..d608c2b 100644 --- a/Doc/whatsnew/2.4.rst +++ b/Doc/whatsnew/2.4.rst @@ -1,5 +1,5 @@ **************************** - What's New in Python 2.4 + What's New in Python 2.4 **************************** :Author: A.M. Kuchling @@ -63,10 +63,10 @@ symmetric differences. :: >>> a.add('z') # add a new element >>> a.update('wxy') # add multiple new elements >>> a - set(['a', 'c', 'b', 'd', 'r', 'w', 'y', 'x', 'z']) + set(['a', 'c', 'b', 'd', 'r', 'w', 'y', 'x', 'z']) >>> a.remove('x') # take one element out >>> a - set(['a', 'c', 'b', 'd', 'r', 'w', 'y', 'z']) + set(['a', 'c', 'b', 'd', 'r', 'w', 'y', 'z']) The :func:`frozenset` type is an immutable version of :func:`set`. Since it is immutable and hashable, it may be used as a dictionary key or as a member of @@ -351,7 +351,7 @@ iterator that loops over the elements of the sequence in reverse order. :: >>> for i in reversed(xrange(1,4)): ... print i - ... + ... 3 2 1 @@ -366,7 +366,7 @@ you want to reverse an iterator, first convert it to a list with :func:`list`. >>> input = open('/etc/passwd', 'r') >>> for line in reversed(list(input)): ... print line - ... + ... root:*:0:0:System Administrator:/var/root:/bin/tcsh ... @@ -650,7 +650,7 @@ the precision of the default context:: 28 >>> decimal.Decimal(1) / decimal.Decimal(7) Decimal("0.1428571428571428571428571429") - >>> decimal.getcontext().prec = 9 + >>> decimal.getcontext().prec = 9 >>> decimal.Decimal(1) / decimal.Decimal(7) Decimal("0.142857143") @@ -665,7 +665,7 @@ raised:: >>> decimal.getcontext().traps[decimal.DivisionByZero] = False >>> decimal.Decimal(1) / decimal.Decimal(0) Decimal("Infinity") - >>> + >>> The :class:`Context` instance also has various methods for formatting numbers such as :meth:`to_eng_string` and :meth:`to_sci_string`. @@ -803,7 +803,7 @@ Here are all of the changes that Python 2.4 makes to the core Python language. >>> 'www.python.org'.split('.', 1) ['www', 'python.org'] 'www.python.org'.rsplit('.', 1) - ['www.python', 'org'] + ['www.python', 'org'] * Three keyword parameters, *cmp*, *key*, and *reverse*, were added to the :meth:`sort` method of lists. These parameters make some common usages of @@ -1045,7 +1045,7 @@ complete list of changes, or look through the CVS logs for all the details. >>> list(d) # list the contents of the deque ['g', 'h', 'i'] >>> 'h' in d # search the deque - True + True Several modules, such as the :mod:`Queue` and :mod:`threading` modules, now take advantage of :class:`collections.deque` for improved performance. (Contributed @@ -1106,13 +1106,13 @@ complete list of changes, or look through the CVS logs for all the details. >>> L = [2, 4, 6, 7, 8, 9, 11, 12, 14] >>> for key_val, it in itertools.groupby(L, lambda x: x % 2): ... print key_val, list(it) - ... + ... 0 [2, 4, 6] 1 [7] 0 [8] 1 [9, 11] 0 [12, 14] - >>> + >>> :func:`groupby` is typically used with sorted input. The logic for :func:`groupby` is similar to the Unix ``uniq`` filter which makes it handy for @@ -1120,21 +1120,21 @@ complete list of changes, or look through the CVS logs for all the details. >>> word = 'abracadabra' >>> letters = sorted(word) # Turn string into a sorted list of letters - >>> letters + >>> letters ['a', 'a', 'a', 'a', 'a', 'b', 'b', 'c', 'd', 'r', 'r'] >>> for k, g in itertools.groupby(letters): ... print k, list(g) - ... + ... a ['a', 'a', 'a', 'a', 'a'] b ['b', 'b'] c ['c'] d ['d'] r ['r', 'r'] >>> # List unique letters - >>> [k for k, g in groupby(letters)] + >>> [k for k, g in groupby(letters)] ['a', 'b', 'c', 'd', 'r'] >>> # Count letter occurrences - >>> [(k, len(list(g))) for k, g in groupby(letters)] + >>> [(k, len(list(g))) for k, g in groupby(letters)] [('a', 5), ('b', 2), ('c', 1), ('d', 1), ('r', 2)] (Contributed by Hye-Shik Chang.) @@ -1175,7 +1175,7 @@ complete list of changes, or look through the CVS logs for all the details. import logging logging.basicConfig(filename='/var/log/application.log', level=0, # Log all messages - format='%(levelname):%(process):%(thread):%(message)') + format='%(levelname):%(process):%(thread):%(message)') Other additions to the :mod:`logging` package include a :meth:`log(level, msg)` convenience method, as well as a :class:`TimedRotatingFileHandler` class that |