[Tutor] error message

[Steven Buck]

I'm running a for loop which returns an error message after the third
iteration (see out[4] at the bottom as evidence).  I don't understand the
error message.  Although I'll continue to do my own digging to debug, I
thought I'd give you all a shot.  Thanks, -steve

Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)]
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In [1]: import psid
In [2]: age = {}
In [3]: for i in range(len(psid.psid)):
   ...:     age[(i)] = psid.psid[i][20]
   ...:
   ...:
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
C:\Documents and Settings\Steve\<ipython console> in <module>()
C:\Python26\lib\site-packages\StataTools.pyc in __getitem__(self, k)
     85         if self._file.tell() != loc:
     86             self._file.seek(loc)
---> 87         return self._next()
     88
     89     ### PyDTA private methods

C:\Python26\lib\site-packages\StataTools.pyc in _next(self)
    167                 else:
    168                     data[i] = self._unpack(typlist[i],
self._file.read(s
elf._col_size(i)))
    169             return data
    170         else:
--> 171             return map(lambda i: self._unpack(typlist[i],
self._file.rea
d(self._col_size(i))), range(self._header['nvar']))
C:\Python26\lib\site-packages\StataTools.pyc in <lambda>(i)
    167                 else:
    168                     data[i] = self._unpack(typlist[i],
self._file.read(s
elf._col_size(i)))
    169             return data
    170         else:
--> 171             return map(lambda i: self._unpack(typlist[i],
self._file.rea
d(self._col_size(i))), range(self._header['nvar']))
C:\Python26\lib\site-packages\StataTools.pyc in _unpack(self, fmt, byt)
    148
    149     def _unpack(self, fmt, byt):
--> 150         d = unpack(self._header['byteorder']+fmt, byt)[0]
    151         if fmt[-1] in self.MISSING_VALUES:
    152             nmin, nmax = self.MISSING_VALUES[fmt[-1]]
error: unpack requires a string argument of length 1
In [4]: age
Out[4]: {0: 22, 1: 51, 2: 42}
In [5]:
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