Support for Python 2.4

crontab/_crontab.py

@@ -1,4 +1,3 @@
-
 '''
 crontab.py
 
@@ -10,7 +9,36 @@
 
 '''
 
-from collections import namedtuple
+# namedtuple is not supported in python 2.4. 
+# If not included in this project, download the 'Named tuples' python recipe from 
+# http://code.activestate.com/recipes/500261/
+# save the recipe as namedtuple24.py
+
+try:
+    from collections import namedtuple
+except:
+    from namedtuple24 import namedtuple
+
+# define 'any'. It was introduced in python 2.5 
+try:
+    all
+except NameError:
+    def all(iterable): 
+        for i in iterable:
+            if not i: 
+                return False
+        return True
+
+# define 'all'. It was introduced in python 2.5 
+try:
+    any
+except NameError:
+    def any(s):
+        for v in s:
+            if v:
+                return True
+        return False
+
 import datetime
 import sys
 
@@ -82,6 +110,20 @@ def _year_incr(dt, m):
         return YEAR + DAY
     return YEAR
 
+# lambda dt,x: dt.replace(day=1) if x > DAY else dt,
+def _month_rollover(dt, x):
+    if x > DAY:
+        return dt.replace(day=1)
+    else:
+        return dt
+
+# lambda dt,x: dt.replace(month=1) if x > DAY else dt,
+def _year_rollover(dt, x):
+    if x > DAY:
+        return dt.replace(month=1)
+    else:
+        return dt
+
 _increments = [
     lambda *a: MINUTE,
     lambda *a: HOUR,
@@ -91,8 +133,8 @@ def _year_incr(dt, m):
     _year_incr,
     lambda dt,x: dt.replace(minute=0),
     lambda dt,x: dt.replace(hour=0),
-    lambda dt,x: dt.replace(day=1) if x > DAY else dt,
-    lambda dt,x: dt.replace(month=1) if x > DAY else dt,
+    _month_rollover,
+    _year_rollover,
     lambda dt,x: dt,
 ]
 
@@ -129,6 +171,13 @@ def _day_decr_reset(dt, x):
         dt += DAY
     return dt - DAY
 
+# lambda dt,x: dt.replace(month=12)if x < -DAY else dt,
+def _year_rollunder(dt, x):
+    if x < -DAY:
+        return dt.replace(month=12)
+    else:
+        return dt
+
 _decrements = [
     lambda *a: -MINUTE,
     lambda *a: -HOUR,
@@ -139,7 +188,7 @@ def _day_decr_reset(dt, x):
     lambda dt,x: dt.replace(minute=59),
     lambda dt,x: dt.replace(hour=23),
     _day_decr_reset,
-    lambda dt,x: dt.replace(month=12)if x < -DAY else dt,
+    _year_rollunder,
     lambda dt,x: dt,
 ]
 

crontab/namedtuple24.py

@@ -0,0 +1,152 @@
+# Recipe URL: http://code.activestate.com/recipes/500261/
+# Recipe Author: Raymond Hettinger 
+# Recipe License: PSF ( http://docs.python.org/2/license.html ) 
+# Recipe Version: Recipe 500261 revision 15 
+
+from operator import itemgetter as _itemgetter
+from keyword import iskeyword as _iskeyword
+import sys as _sys
+
+def namedtuple(typename, field_names, verbose=False, rename=False):
+    """Returns a new subclass of tuple with named fields.
+
+    >>> Point = namedtuple('Point', 'x y')
+    >>> Point.__doc__                   # docstring for the new class
+    'Point(x, y)'
+    >>> p = Point(11, y=22)             # instantiate with positional args or keywords
+    >>> p[0] + p[1]                     # indexable like a plain tuple
+    33
+    >>> x, y = p                        # unpack like a regular tuple
+    >>> x, y
+    (11, 22)
+    >>> p.x + p.y                       # fields also accessable by name
+    33
+    >>> d = p._asdict()                 # convert to a dictionary
+    >>> d['x']
+    11
+    >>> Point(**d)                      # convert from a dictionary
+    Point(x=11, y=22)
+    >>> p._replace(x=100)               # _replace() is like str.replace() but targets named fields
+    Point(x=100, y=22)
+
+    """
+
+    # Parse and validate the field names.  Validation serves two purposes,
+    # generating informative error messages and preventing template injection attacks.
+    if isinstance(field_names, basestring):
+        field_names = field_names.replace(',', ' ').split() # names separated by whitespace and/or commas
+    field_names = tuple(map(str, field_names))
+    if rename:
+        names = list(field_names)
+        seen = set()
+        for i, name in enumerate(names):
+            if (not min(c.isalnum() or c=='_' for c in name) or _iskeyword(name)
+                or not name or name[0].isdigit() or name.startswith('_')
+                or name in seen):
+                    names[i] = '_%d' % i
+            seen.add(name)
+        field_names = tuple(names)
+    for name in (typename,) + field_names:
+        if not min(c.isalnum() or c=='_' for c in name):
+            raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name)
+        if _iskeyword(name):
+            raise ValueError('Type names and field names cannot be a keyword: %r' % name)
+        if name[0].isdigit():
+            raise ValueError('Type names and field names cannot start with a number: %r' % name)
+    seen_names = set()
+    for name in field_names:
+        if name.startswith('_') and not rename:
+            raise ValueError('Field names cannot start with an underscore: %r' % name)
+        if name in seen_names:
+            raise ValueError('Encountered duplicate field name: %r' % name)
+        seen_names.add(name)
+
+    # Create and fill-in the class template
+    numfields = len(field_names)
+    argtxt = repr(field_names).replace("'", "")[1:-1]   # tuple repr without parens or quotes
+    reprtxt = ', '.join('%s=%%r' % name for name in field_names)
+    template = '''class %(typename)s(tuple):
+        '%(typename)s(%(argtxt)s)' \n
+        __slots__ = () \n
+        _fields = %(field_names)r \n
+        def __new__(_cls, %(argtxt)s):
+            return _tuple.__new__(_cls, (%(argtxt)s)) \n
+        @classmethod
+        def _make(cls, iterable, new=tuple.__new__, len=len):
+            'Make a new %(typename)s object from a sequence or iterable'
+            result = new(cls, iterable)
+            if len(result) != %(numfields)d:
+                raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
+            return result \n
+        def __repr__(self):
+            return '%(typename)s(%(reprtxt)s)' %% self \n
+        def _asdict(self):
+            'Return a new dict which maps field names to their values'
+            return dict(zip(self._fields, self)) \n
+        def _replace(_self, **kwds):
+            'Return a new %(typename)s object replacing specified fields with new values'
+            result = _self._make(map(kwds.pop, %(field_names)r, _self))
+            if kwds:
+                raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
+            return result \n
+        def __getnewargs__(self):
+            return tuple(self) \n\n''' % locals()
+    for i, name in enumerate(field_names):
+        template += '        %s = _property(_itemgetter(%d))\n' % (name, i)
+    if verbose:
+        print template
+
+    # Execute the template string in a temporary namespace
+    namespace = dict(_itemgetter=_itemgetter, __name__='namedtuple_%s' % typename,
+                     _property=property, _tuple=tuple)
+    try:
+        exec template in namespace
+    except SyntaxError, e:
+        raise SyntaxError(e.message + ':\n' + template)
+    result = namespace[typename]
+
+    # For pickling to work, the __module__ variable needs to be set to the frame
+    # where the named tuple is created.  Bypass this step in enviroments where
+    # sys._getframe is not defined (Jython for example) or sys._getframe is not
+    # defined for arguments greater than 0 (IronPython).
+    try:
+        result.__module__ = _sys._getframe(1).f_globals.get('__name__', '__main__')
+    except (AttributeError, ValueError):
+        pass
+
+    return result
+
+
+
+
+
+
+if __name__ == '__main__':
+    # verify that instances can be pickled
+    from cPickle import loads, dumps
+    Point = namedtuple('Point', 'x, y', True)
+    p = Point(x=10, y=20)
+    assert p == loads(dumps(p, -1))
+
+    # test and demonstrate ability to override methods
+    class Point(namedtuple('Point', 'x y')):
+        @property
+        def hypot(self):
+            return (self.x ** 2 + self.y ** 2) ** 0.5
+        def __str__(self):
+            return 'Point: x=%6.3f y=%6.3f hypot=%6.3f' % (self.x, self.y, self.hypot)
+
+    for p in Point(3,4), Point(14,5), Point(9./7,6):
+        print p
+
+    class Point(namedtuple('Point', 'x y')):
+        'Point class with optimized _make() and _replace() without error-checking'
+        _make = classmethod(tuple.__new__)
+        def _replace(self, _map=map, **kwds):
+            return self._make(_map(kwds.get, ('x', 'y'), self))
+
+    print Point(11, 22)._replace(x=100)
+
+    import doctest
+    TestResults = namedtuple('TestResults', 'failed attempted')
+    print TestResults(*doctest.testmod())