import random as rnd
#############################################################################################

def ll_insert(head, name, phone):
    next_node = {'name': name, 'phone': phone, 'next': None}
    if head is None: return next_node 

    running = head
    while running is not None:
        if running['name'] == name:
            running['phone'] = phone
            return head
        running = running['next']

    running = head
    while running['next'] is not None: running = running['next']
    running['next'] = next_node
    return head

def ll_find(head, name):
    running = head
    flag = True

    while flag:
        if running['name'] == name:
            return running['phone']
        running = running['next']
        flag = running is not None

    return None



def main():

    head = None

    print('======== TESTING LL_INSERT ==========')
    Name = ['Dima', 'Ivan', 'Maxim', 'Alex']

    for _ in range(10):
        name = Name[rnd.randint(0, 3)]
        phone = str(rnd.randint(0,9)) + str(rnd.randint(0,9)) + str(rnd.randint(0,9)) + '-' + \
                str(rnd.randint(0,9)) + str(rnd.randint(0,9)) + str(rnd.randint(0,9)) 
        print(name, phone)
        head = ll_insert(head, name, phone)
        print(head)
        print('-----------------------------------\n')
    print('======== END TESTING ================')


    print('======== TESTING LL_FIND ==========') 
    Name.append('Masha')
    for i in range(len(Name)):
        name = Name[i]
        print(name, ":", ll_find(head, name))
    print("======== END TESTING =============")


if __name__ == "__main__":
    main()