They bring nothing of value (we never use import * anyway) and introduce
a maintenance burden.
The __all__ that I left might not be very useful either but at least
they are not a pain to maintain; they are also used by pyflakes in some
cases.
When a function returns a char*, it is necessary to tell it to ctypes,
instead it returns an integer. On a 64 bits CPU, pointers can overflow the
integer, and result to an unvalid pointer given to c_char_p.