如何修改对象

import threading

class SafeCounter:
    def __init__(self):
        self._value = 0
        self._lock = threading.Lock()

    def increment(self):
        with self._lock:
            self._value += 1

counter = SafeCounter()
threads = [threading.Thread(target=counter.increment) for _ in range(100)]
for thread in threads:
    thread.start()
for thread in threads:
    thread.join()

print(counter._value)  # 输出 100

import copy

original = {'a': [1, 2, 3]}
shallow_copy = copy.copy(original)
deep_copy = copy.deepcopy(original)

original['a'].append(4)

print(original)       # 输出 {'a': [1, 2, 3, 4]}
print(shallow_copy)   # 输出 {'a': [1, 2, 3, 4]}
print(deep_copy)      # 输出 {'a': [1, 2, 3]}

# 示例：Python中的不可变对象
original_tuple = (1, 2, 3)
new_tuple = original_tuple + (4,)
print(new_tuple)  # 输出 (1, 2, 3, 4)