I can't tell (might have got lost in the edit), but PEP8 suggests the arguments are more indented than the function body: def very_long_function_name(

I can't tell (might have got lost in the edit), but PEP8 suggests the arguments are more indented than the function body: def very_long_function_name( arg_one, arg_two, arg_three, arg_four ): pass For data structures, I definitely prefer the bracket to be on it's own line, but for function definitions I don't, so I'm also a fan of: def very_long_function_name( arg_one, arg_two, arg_three, arg_four): pass def very_long_function_name( arg_one, arg_two, arg_three, arg_four): pass