请教各位大神，python初学者的三个问题：有关一些基本的方法（目前学到python编程从入门到实践第7章）（已解决）

刚刚学习书上7.3的内容，有些疑惑，希望大神们能帮忙解答一下！谢谢！
第一个问题：是不是经历过while过后，sandwich_orders就与最初的sandwich_orders不同了

sandwich_orders = ['pastrami','tuna','pastrami','sausage','lemon','pastrami','tuna','lemon']
finished_sandwiches = []

print("Pastrami is already sold out.")

while 'pastrami' in sandwich_orders:
    sandwich_orders.remove('pastrami')

finished_sandwiches = sandwich_orders
for finished_sandwich in finished_sandwiches:
    print(finished_sandwich)

第二个问题：finished_sandwiches.append(sandwich)在此是个什么含义？我能否用其他方式来表达？

sandwich_orders = ['吞拿鱼三明治','火腿肠三明治','金枪鱼三明治']
finished_sandwhiches = []

while sandwich_orders:
    sandwich = sandwich_orders.pop()
    print(f"I made your {sandwich}.")

    finished_sandwhiches.append(sandwich)

for finished_sandwhich in finished_sandwhiches:
    print(finished_sandwhich)

第三个问题：为什么运行时会先问我What is your name等我做出回答才会有下一个问题出现，而不是两个问题一起呈现？responses[name] = response是什么意思？

responses = {}

polling_active = True

while polling_active:
    name = input("\nWhat is your name? ")
    response = input("Which mountain would you like to climb someday? ")

    responses[name] = response

    repeat = input("Would you like to let another person respond? (yes/ no) ")
    if repeat == 'no':
        polling_active = False

print("\n--- Poll Results ---")
for name, response in responses.items():
    print(f"{name} would like to climb {response}.")