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Edit File : Rev.py \| Size : 2.00 KB
''' A class which presents the reverse of a sequence without duplicating it. From: "Steven D. Majewski" <sdm7g@elvis.med.virginia.edu> It works on mutable or inmutable sequences. >>> chars = list(Rev('Hello World!')) >>> print ''.join(chars) !dlroW olleH The .forw is so you can use anonymous sequences in __init__, and still keep a reference the forward sequence. ) If you give it a non-anonymous mutable sequence, the reverse sequence will track the updated values. ( but not reassignment! - another good reason to use anonymous values in creating the sequence to avoid confusion. Maybe it should be change to copy input sequence to break the connection completely ? ) >>> nnn = range(3) >>> rnn = Rev(nnn) >>> for n in rnn: print n ... 2 1 0 >>> for n in range(4, 6): nnn.append(n) # update nnn ... >>> for n in rnn: print n # prints reversed updated values ... 5 4 2 1 0 >>> nnn = nnn[1:-1] >>> nnn [1, 2, 4] >>> for n in rnn: print n # prints reversed values of old nnn ... 5 4 2 1 0 # >>> WH = Rev('Hello World!') >>> print WH.forw, WH.back Hello World! !dlroW olleH >>> nnn = Rev(range(1, 10)) >>> print nnn.forw [1, 2, 3, 4, 5, 6, 7, 8, 9] >>> print nnn.back [9, 8, 7, 6, 5, 4, 3, 2, 1] >>> rrr = Rev(nnn) >>> rrr <1, 2, 3, 4, 5, 6, 7, 8, 9> ''' class Rev: def __init__(self, seq): self.forw = seq self.back = self def __len__(self): return len(self.forw) def __getitem__(self, j): return self.forw[-(j + 1)] def __repr__(self): seq = self.forw if isinstance(seq, list): wrap = '[]' sep = ', ' elif isinstance(seq, tuple): wrap = '()' sep = ', ' elif isinstance(seq, str): wrap = '' sep = '' else: wrap = '<>' sep = ', ' outstrs = [str(item) for item in self.back] return wrap[:1] + sep.join(outstrs) + wrap[-1:] def _test(): import doctest, Rev return doctest.testmod(Rev) if __name__ == "__main__": _test() Back

Edit File : Rev.py | Size : 2.00 KB

'''
A class which presents the reverse of a sequence without duplicating it.
From: "Steven D. Majewski" <sdm7g@elvis.med.virginia.edu>

It works on mutable or inmutable sequences.

>>> chars = list(Rev('Hello World!'))
>>> print ''.join(chars)
!dlroW olleH

The .forw is so you can use anonymous sequences in __init__, and still
keep a reference the forward sequence. )
If you give it a non-anonymous mutable sequence, the reverse sequence
will track the updated values. ( but not reassignment! - another
good reason to use anonymous values in creating the sequence to avoid
confusion. Maybe it should be change to copy input sequence to break
the connection completely ? )

>>> nnn = range(3)
>>> rnn = Rev(nnn)
>>> for n in rnn: print n
...
2
1
0
>>> for n in range(4, 6): nnn.append(n)   # update nnn
...
>>> for n in rnn: print n     # prints reversed updated values
...
5
4
2
1
0
>>> nnn = nnn[1:-1]
>>> nnn
[1, 2, 4]
>>> for n in rnn: print n     # prints reversed values of old nnn
...
5
4
2
1
0

#
>>> WH = Rev('Hello World!')
>>> print WH.forw, WH.back
Hello World! !dlroW olleH
>>> nnn = Rev(range(1, 10))
>>> print nnn.forw
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print nnn.back
[9, 8, 7, 6, 5, 4, 3, 2, 1]

>>> rrr = Rev(nnn)
>>> rrr
<1, 2, 3, 4, 5, 6, 7, 8, 9>

'''

class Rev:
    def __init__(self, seq):
        self.forw = seq
        self.back = self

def __len__(self):
        return len(self.forw)

def __getitem__(self, j):
        return self.forw[-(j + 1)]

def __repr__(self):
        seq = self.forw
        if isinstance(seq, list):
            wrap = '[]'
            sep = ', '
        elif isinstance(seq, tuple):
            wrap = '()'
            sep = ', '
        elif isinstance(seq, str):
            wrap = ''
            sep = ''
        else:
            wrap = '<>'
            sep = ', '
        outstrs = [str(item) for item in self.back]
        return wrap[:1] + sep.join(outstrs) + wrap[-1:]

def _test():
    import doctest, Rev
    return doctest.testmod(Rev)

if __name__ == "__main__":
    _test()

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