如何从字典中删除记录？

my_dict = {'a': 1, 'b': 2, 'c': 3}
key_to_remove = 'b'

if key_to_remove in my_dict:
    del my_dict[key_to_remove]
else:
    print(f"The key {key_to_remove} does not exist in the dictionary.")

print(my_dict)  # 输出: {'a': 1, 'c': 3}

my_dict = {'a': 1, 'b': 2, 'c': 3}
key_to_remove = 'b'

removed_value = my_dict.pop(key_to_remove, None)
if removed_value is not None:
    print(f"The value {removed_value} for key {key_to_remove} was removed.")
else:
    print(f"The key {key_to_remove} does not exist in the dictionary.")

print(my_dict)  # 输出: {'a': 1, 'c': 3}

my_dict = {'a': 1, 'b': 2, 'c': 3}
keys_to_remove = ['b', 'd']

# 创建一个新字典，排除要删除的键
new_dict = {k: v for k, v in my_dict.items() if k not in keys_to_remove}

print(new_dict)  # 输出: {'a': 1, 'c': 3}