EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.2 / Demo / classes / Rev.py

'''\r
A class which presents the reverse of a sequence without duplicating it.\r
From: "Steven D. Majewski" <sdm7g@elvis.med.virginia.edu>\r
\r
It works on mutable or inmutable sequences.\r
\r
>>> chars = list(Rev('Hello World!'))\r
>>> print ''.join(chars)\r
!dlroW olleH\r
\r
The .forw is so you can use anonymous sequences in __init__, and still\r
keep a reference the forward sequence. )\r
If you give it a non-anonymous mutable sequence, the reverse sequence\r
will track the updated values. ( but not reassignment! - another\r
good reason to use anonymous values in creating the sequence to avoid\r
confusion. Maybe it should be change to copy input sequence to break\r
the connection completely ? )\r
\r
>>> nnn = range(3)\r
>>> rnn = Rev(nnn)\r
>>> for n in rnn: print n\r
...\r
2\r
1\r
0\r
>>> for n in range(4, 6): nnn.append(n)   # update nnn\r
...\r
>>> for n in rnn: print n     # prints reversed updated values\r
...\r
5\r
4\r
2\r
1\r
0\r
>>> nnn = nnn[1:-1]\r
>>> nnn\r
[1, 2, 4]\r
>>> for n in rnn: print n     # prints reversed values of old nnn\r
...\r
5\r
4\r
2\r
1\r
0\r
\r
#\r
>>> WH = Rev('Hello World!')\r
>>> print WH.forw, WH.back\r
Hello World! !dlroW olleH\r
>>> nnn = Rev(range(1, 10))\r
>>> print nnn.forw\r
[1, 2, 3, 4, 5, 6, 7, 8, 9]\r
>>> print nnn.back\r
[9, 8, 7, 6, 5, 4, 3, 2, 1]\r
\r
>>> rrr = Rev(nnn)\r
>>> rrr\r
<1, 2, 3, 4, 5, 6, 7, 8, 9>\r
\r
'''\r
\r
class Rev:\r
    def __init__(self, seq):\r
        self.forw = seq\r
        self.back = self\r
\r
    def __len__(self):\r
        return len(self.forw)\r
\r
    def __getitem__(self, j):\r
        return self.forw[-(j + 1)]\r
\r
    def __repr__(self):\r
        seq = self.forw\r
        if isinstance(seq, list):\r
            wrap = '[]'\r
            sep = ', '\r
        elif isinstance(seq, tuple):\r
            wrap = '()'\r
            sep = ', '\r
        elif isinstance(seq, str):\r
            wrap = ''\r
            sep = ''\r
        else:\r
            wrap = '<>'\r
            sep = ', '\r
        outstrs = [str(item) for item in self.back]\r
        return wrap[:1] + sep.join(outstrs) + wrap[-1:]\r
\r
def _test():\r
    import doctest, Rev\r
    return doctest.testmod(Rev)\r
\r
if __name__ == "__main__":\r
    _test()\r