Hi, I'm new to the Python source and I have a (hopefully) quick question that someone more familiar with it should be able to answer so I can continue on my way to understanding how Python is put together. I have started looking at the parser and have gotten a little confused about how the grammar is instantiated (perhaps the wrong term). Here's how I understand things at the moment. graminit.c contains the definition of the grammar in terms of static structures. Everything seems simple enough until I get to the DFA (in graminit.c): static dfa dfas[84] = { {256, "single_input", 0, 3, states_0, "\004\050\014\000\000\000\000\025\074\005\023\310\011\020\004\000\300\020\222\006\201"}, ... I assume that the last bit of my snippet (\004\050\014\ ...) is a bitset structure. When I look at bitset it is defined as a char array. Can someone explain how this works please? I've never come across escape sequences like this; I've only ever seen \0 (nul) before; not \2, \3 etc. or are they not escape sequences, but literal forward slashes. Thanks, Ty