get_comments.py

import idautils
comments = {}
for func in idautils.Functions():
    flags = idc.get_func_attr(func, FUNCATTR_FLAGS) # skip library & thunk functions
    if flags & FUNC_LIB or flags & FUNC_THUNK:
        continue
    dism_addr = list(idautils.FuncItems(func))
    for ea in dism_addr:
        temp = idc.get_cmt(ea, 0)
        if temp:
            comments[ea] = temp
        temp = idc.get_cmt(ea, 1)
        if temp:
            comments[ea] = temp   
print comments