def get_max_num(list_of_nums): # body of function goes here The use of underscores as word separators dates back to the late 1960s. It is particularly associated with C, is found in The C Programming Language (1978), and contrasted with pascal case (a type of camel case). However, the convention traditionally had no specific name: the Python programming language style guide refers to it simply as "lowercase_with_underscores".[2] Within Usenet the term snake_case was first seen in the Rubycommunity in 2004,[3] used by Gavin Kistner, writing: BTW...what _do you call that naming style? snake_case? That's what I'll call it until someone corrects me.