mpy-cross questions

[jimmo]

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>>> sys.path=['/', '/lib', '']

You can't override members of a built-in module. The definition of these modules is in ROM.

But as you've discovered, the member itself is a list, and therefore supports the insert method.

Seems that's hardcoded in ports/esp8266/qstrdefsport.h:

This is just the definition of the QSTR values that are stored in this list. It allows code elsewhere to write `mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_lib));` which is what actually defines the default value of sys.path.