StackOverflow2013

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PO
primarykey
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11548577
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0
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0
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0
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2012-07-18T19:08:24.623
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0
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2012-07-19T21:01:50.473
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2012-07-19T21:01:50.473
LastEditorUserId
502519
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502519
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1045344
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2
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0
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0
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text
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<p>I like to use generators for ids. Allow the generator to maintain a list of ids already used.</p> <pre><code># devplayer@gmail.com # 2012-07(jul)-19 class MakeUniqueStr(object): ''' unqstr = MakeUniqueStr(default_name='widget', sep='_') print(repr(unqstr('window'))) print(repr(unqstr('window'))) print(repr(unqstr('window'))) print(repr(unqstr('hello'))) print(repr(unqstr('hello'))) print(repr(unqstr('window'))) print(repr(unqstr('hello'))) 'window' 'window_00000' 'window_00001' 'hello' 'hello_00000' 'window_00002' 'hello_00001' ''' def __init__(self, default_name='default', sep='_'): self.default_name = default_name self.last_base_name = default_name self.sep = sep self.used_names = [] self.generator = self.Generator() self.generator.next() # initialize def __call__(self, name=None): if name <> None: self.last_base_name = name return self.generator.send(self.last_base_name) def _MakeName(self, name, index=1): '''_MakeName is called by the Generator. Generator will always have a name and an index to pass to _MakeName. Over ride this method to customize it.''' return name + self.sep + '%0.5d' % index def Generator(self): try_name = yield 'ready' # initialize index = 0 while 1: if try_name not in self.used_names: self.used_names.append( try_name ) sent_name = yield try_name try_name = sent_name continue try_name = self._MakeName( sent_name, index ) while try_name in self.used_names: index += 1 try_name = self._MakeName( sent_name, index ) index = 0 </code></pre> <p>Although this is not a memory effiecent way for huge in-memory datasets. If you wanted to use something like that then modify this to have the OS handle caching to a file... say via a named pipe.</p>
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1. POHow do you create an incremental ID in a Python Class
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1. PTAnswer
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1. USDevPlayer
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1. USDevPlayer
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