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2012-01-06T17:42:45.427
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It's a non-trivial task. Probably the most "pythonic" way would be to create a class. I took the liberty and time to make an example: <pre><code>from collections import namedtuple class DataPack(object): def __init__(self, line, seperator =',', headerfields = None, groupfields = None): self.seperator = seperator self.header_fields = headerfields or ('date', 'time', 'nr', 'groups') self.group_fields = groupfields or ('nr', 'sensors','controlfields', 't1values', 't2values') Header = namedtuple('Header', self.header_fields) self.header_part = line.split(self.seperator)[:self.data_start] self.data_start = len(self.header_fields) self.data_part = line.split(self.seperator)[self.data_start:] self.header = Header(*self.header_part) self.groups = self._create_groups(self.data_part, self.header.groups) def _create_groups(self, datalst, groups): """nr, sensors controllfield * 4, t1value*sensors, t2value*sensors """ Group = namedtuple('DataGroup', self.group_fields) _groups = [] for i in range(int(groups)): nr = datalst[0] sensors = datalst[1] controlfields = datalst [2:6] t1values = datalst[6:6+int(sensors)] t2values = datalst[6+int(sensors):6+int(sensors)*2] _groups.append(Group(nr, sensors, controlfields, t1values, t2values)) datalst = datalst[6+int(sensors)*2:] return _groups def __str__(self): _return = [] for group in self.groups: for sensor in range(int(group.sensors)): _return.append('%s, ' % self.header.date.replace('-','/')) _return.append('%s, ' % self.header.time) _return.append('%s, ' % group.nr) _return.append('%s, ' % (int(sensor) + 1,)) _return.append('(%s, ' % group.t1values[int(sensor)]) _return.append('%s)\n' % group.t2values[int(sensor)]) return u''.join(_return) if __name__ == '__main__': line = """2012-01-02,12:50:32,658,2,1,2,0,0,0,0,1556,1555,62,60,2,3,0,0,0,0,1559,1557,1557,63,64,65,0.305,0.265,0.304,0.308,0.309""" data = DataPack(line) for i in data.header: print i, for i in data.groups: print '\n',i print '\n',data print 'cfield 0:2 ', data.groups[0].controlfields[2] print 't2value 1:2 ', data.groups[1].t2values[2] </code></pre> On bigger changes to the input-data you would have to subclass and overwrite the <code>_create_groups</code> and <code>__str__</code> methods.
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1. POExtracting data from a string where the data structure is embedded in the string itself
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1. CODon, this approach certainly makes it more reusable. Not being trained in OO makes that I tend to "forget" this approach. Thx
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2. CO@Don Question: *It's a non-trivial task* - Clearly you have a different boundary for triviality [than most engineers I've encountered](http://fishbowl.pastiche.org/2007/07/17/understanding_engineers_feasibility/), especially considering that there are two answers on this page, written in a matter of minutes after the question was asked.
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