Need help creating variable for unpack statement

[alfred6465 at my-deja.com]

I'm new to Python and have a dumb question (please be patient with
me!!!!)....

I have a variable called length which contains a value of 6 and a
variable called fmt which contains 's'.

length = 6
fmt = 's'

How do I combine those into one variable with the value of '6s'.

Once I have a variable called fmt holding the value of 6s, I want to
place it into a struct.unpack statement (see below).

test = struct.unpack(fmt,  f[38:44])

Thanks for the help in advance.
Alfred


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