The brlcad bu_bitv is very intelligently implemented. But it turns out to be very difficult to wrap that in the python code which is required for BOT primitive
Below, I explain the situation further.
-> The bu_bitv has a vector "bits" which is a unsigned char type of data. (of size 2 as per the definition)
-> Now during the initialization of a bu_bitv, only the required memory is allocated as required by the number of bits. So for example if I have only 8 bits to store the api is programmed such that the memory which will be allocated will be = sizeof(bu_bitv) - 2(substract the 2) + 1 (allocate a byte for 8 bits)
->Now while importing a structure in python code we cannot determine whether extra memory has been allocated or not!
Please suggest remedial measure I should adopt. I spent a long time understanding the code and what is happening. ;-) Please use the below links for understanding further.
bot structure : 
bit_v : 
A typical usage of bit_v for bot :