#! /usr/bin/python3
# ===================================================================
# test passing a list into a class and making a copy of it
# so that it is independent from the external list
# ===================================================================

from copy import deepcopy

# -------------------------------------------------------------------
# ---- class definition
# -------------------------------------------------------------------

class testClass:

    def __init__(self,lst):
       self._lst = lst.deepcopy()

    def dump_list(self):
        i = 0;
        print()
        print('---class list (copy of external list)----------')
        i = 0
        for l in self._lst:
            print(f'[{i}] {l}')
            i+= 1
        print('-----------------------------------------------')

    def set_list_value(self,idx,value):
        self._lst[idx] = value

    def remove_list_value(self,value):
        self._lst.remove(value)

    def remove_list_index(self,idx):
        self._lst.remove(self._lst[idx])

# -------------------------------------------------------------------
# ---- support function: dump list
# -------------------------------------------------------------------

def dump_list(lst):
    print('---external list-------------------------------')
    i = 0
    for l in lst:
        print(f'[{i}] {l}')
        i += 1
    print('-----------------------------------------------')

# -------------------------------------------------------------------
# ---- main
# -------------------------------------------------------------------

if __name__ == '__main__':

    lst = [ 1, 2, 3, 'abc', 'xyz' ]

    test = testClass(lst)

    print()
    dump_list(lst)
    test.dump_list()

    print()
    print('==== inset and remove values from class list ====')

    print() 
    print('replacing idx=[2] value="qrs"')
    test.set_list_value(2,'qrs')
    print('replacing idx=[3] value=45')
    test.set_list_value(3,45)

    print()
    print('removing index = 4')
    test.remove_list_index(4)
    print('removing value 1')
    test.remove_list_value(1)

    print()
    dump_list(lst)
    test.dump_list()