[Tutor] binary data struct module

[John]

Hello,

I have an unformatted mixed type binary file I'm trying to read into Python.
So far, I've gotten as far as:

f2=file(infile,'rb')

Dfmt=['3i','13s','7i','2f','2i','2f','2i','i']  #format for binary reading
first bits

if f2:
    print infile + ' has been opened'
    #for ft in Dfmt:
    #  print ft
    a=(struct.unpack(ft,f2.read(struct.calcsize(ft))) for ft in Dfmt)
    for ln in a: print ln

Which gives me:

/cygdrive/c/washakie/binfile has been opened
(21, 20060612, 0)
('Version 4.3',)
(21, 12, -86400, -86400, -900, 12, 24)
(-179.0, -90.0)
(360, 180)
(1.0, 1.0)
(24, 16)
(3,)

however, how can I now assign variables based on the 'generator object' a?
What exactly is this? When I try to do something like:

print a[0]
or
print a(0)

I get the error:
Traceback (most recent call last):
  File "readheader.py", line 20, in <module>
    print a[0]
TypeError: 'generator' object is unsubscriptable

My question is, how can I now work with 'a' so that i can use the values?

Thanks!



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