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    <pre><code>#!/usr/bin/env python import sys ##Initials,Last,First,ShiftStart,ShiftEnd s='''BAB,Smith,Bob,10:00a,1:00p JCJ,Jones,Jill,11:00a,3:00p JIH,Hernandez,Jose,1:00p,4:00p BAB,Smith,Bob,1:00p,3:00p JIH,Hernandez,Jose,5:00p,9:00p JCJ,Jones,Jill,3:00p,3:30p JCJ,Jones,Jill,3:30p,5:00p DJM,Martin,Dominique,8:00a,11:00a''' db = {} for line in s.split('\n'): Initials,Last,First,ShiftStart,ShiftEnd = line.split(',') if Initials in db: db[Initials][2].append((ShiftStart,ShiftEnd)) else: db[Initials] = (Last,First,[(ShiftStart,ShiftEnd)]) for Initials,v in db.iteritems(): Last,First,shifts = v sys.stdout.write(Initials + ',') sys.stdout.write(Last + ',' + First) for shift in shifts: ShiftStart,ShiftEnd = shift sys.stdout.write(',' + ShiftStart + ',' + ShiftEnd) sys.stdout.write('\n') </code></pre> <p>Alternatively, you could do a very object-oriented program:</p> <pre><code>import sys ##Initials,Last,First,ShiftStart,ShiftEnd s='''BAB,Smith,Bob,10:00a,1:00p JCJ,Jones,Jill,11:00a,3:00p JIH,Hernandez,Jose,1:00p,4:00p BAB,Smith,Bob,1:00p,3:00p JIH,Hernandez,Jose,5:00p,9:00p JCJ,Jones,Jill,3:00p,3:30p JCJ,Jones,Jill,3:30p,5:00p DJM,Martin,Dominique,8:00a,11:00a''' class Shift(object): def __init__(self,ShiftStart,ShiftEnd): self.ShiftStart,self.ShiftEnd = ShiftStart,ShiftEnd def __str__(self): return '%s,%s' % (ShiftStart,ShiftEnd) class Person(object): def __eq__(self, p): if self.Initials != p.Initials: return False if p.Last is not None and self.Last != p.Last: return False if p.First is not None and self.First != p.First: return False return True def __init__(self,Initials,Last,First): self.Initials,self.Last,self.First = Initials,Last,First self.Shifts = [] def __str__(self): return '%s,%s,%s' % (self.Initials,self.Last,self.First) def AddShift(people, person, shift): try: person = people[people.index(person)] except ValueError: people.append(person) person.Shifts.append(shift) people = [] for line in s.split('\n'): Initials,Last,First,ShiftStart,ShiftEnd = line.split(',') AddShift(people, Person(Initials,Last,First), Shift(ShiftStart,ShiftEnd)) for person in people: print '%s,%s' %(person, ','.join(map(str,person.Shifts))) </code></pre>
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