Package ganeti :: Module compat
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Source Code for Module ganeti.compat

  1  # 
  2  # 
  3   
  4  # Copyright (C) 2010, 2011 Google Inc. 
  5  # 
  6  # This program is free software; you can redistribute it and/or modify 
  7  # it under the terms of the GNU General Public License as published by 
  8  # the Free Software Foundation; either version 2 of the License, or 
  9  # (at your option) any later version. 
 10  # 
 11  # This program is distributed in the hope that it will be useful, but 
 12  # WITHOUT ANY WARRANTY; without even the implied warranty of 
 13  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
 14  # General Public License for more details. 
 15  # 
 16  # You should have received a copy of the GNU General Public License 
 17  # along with this program; if not, write to the Free Software 
 18  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
 19  # 02110-1301, USA. 
 20   
 21   
 22  """Module containing backported language/library functionality. 
 23   
 24  """ 
 25   
 26  import itertools 
 27  import operator 
 28   
 29  try: 
 30    # pylint: disable=F0401 
 31    import functools 
 32  except ImportError: 
 33    functools = None 
 34   
 35  try: 
 36    # pylint: disable=F0401 
 37    import roman 
 38  except ImportError: 
 39    roman = None 
 40   
 41   
 42  # compat.md5_hash and compat.sha1_hash can be called to generate and md5 and a 
 43  # sha1 hashing modules, under python 2.4, 2.5 and 2.6, even though some changes 
 44  # went on. compat.sha1 is python-version specific and is used for python 
 45  # modules (hmac, for example) which have changed their behavior as well from 
 46  # one version to the other. 
 47  try: 
 48    # pylint: disable=F0401 
 49    # Yes, we're not using the imports in this module. 
 50    # pylint: disable=W0611 
 51    from hashlib import md5 as md5_hash 
 52    from hashlib import sha1 as sha1_hash 
 53    # this additional version is needed for compatibility with the hmac module 
 54    sha1 = sha1_hash 
 55  except ImportError: 
 56    from md5 import new as md5_hash 
 57    import sha 
 58    sha1 = sha 
 59    sha1_hash = sha.new 
 60   
 61   
62 -def _all(seq):
63 """Returns True if all elements in the iterable are True. 64 65 """ 66 for _ in itertools.ifilterfalse(bool, seq): 67 return False 68 return True
69 70
71 -def _any(seq):
72 """Returns True if any element of the iterable are True. 73 74 """ 75 for _ in itertools.ifilter(bool, seq): 76 return True 77 return False
78 79 80 try: 81 # pylint: disable=E0601 82 # pylint: disable=W0622 83 all = all 84 except NameError: 85 all = _all 86 87 try: 88 # pylint: disable=E0601 89 # pylint: disable=W0622 90 any = any 91 except NameError: 92 any = _any 93 94
95 -def partition(seq, pred=bool): # pylint: disable=W0622
96 """Partition a list in two, based on the given predicate. 97 98 """ 99 return (list(itertools.ifilter(pred, seq)), 100 list(itertools.ifilterfalse(pred, seq))) 101 102 103 # Even though we're using Python's built-in "partial" function if available, 104 # this one is always defined for testing.
105 -def _partial(func, *args, **keywords): # pylint: disable=W0622
106 """Decorator with partial application of arguments and keywords. 107 108 This function was copied from Python's documentation. 109 110 """ 111 def newfunc(*fargs, **fkeywords): 112 newkeywords = keywords.copy() 113 newkeywords.update(fkeywords) 114 return func(*(args + fargs), **newkeywords) # pylint: disable=W0142 115 116 newfunc.func = func 117 newfunc.args = args 118 newfunc.keywords = keywords 119 return newfunc 120 121 122 if functools is None: 123 partial = _partial 124 else: 125 partial = functools.partial 126 127
128 -def TryToRoman(val, convert=True):
129 """Try to convert a value to roman numerals 130 131 If the roman module could be loaded convert the given value to a roman 132 numeral. Gracefully fail back to leaving the value untouched. 133 134 @type val: integer 135 @param val: value to convert 136 @type convert: boolean 137 @param convert: if False, don't try conversion at all 138 @rtype: string or typeof(val) 139 @return: roman numeral for val, or val if conversion didn't succeed 140 141 """ 142 if roman is not None and convert: 143 try: 144 return roman.toRoman(val) 145 except roman.RomanError: 146 return val 147 else: 148 return val
149 150 #: returns the first element of a list-like value 151 fst = operator.itemgetter(0) 152 153 #: returns the second element of a list-like value 154 snd = operator.itemgetter(1) 155