my_dict = {"name": "John Doe", "age": 30, "city": "New York"}

my_dict = dict(name="John Doe", age=30, city="New York")

my_dict = {key: value for key, value in zip(["name", "age", "city"], ["John Doe", 30, "New York"])}

my_dict["job"] = "Software Engineer"

my_dict["age"] = 31

del my_dict["city"]

value = my_dict["name"]

value = my_dict.get("phone", "Not provided")

if "email" in my_dict:
# 键存在，执行某些操作

for key in my_dict:
print(key)

for key, value in my_dict.items():
print(key, value)

for value in my_dict.values():
print(value)

for key in my_dict.keys():
print(key)

my_dict1 = {"name": "John Doe", "age": 30}
my_dict2 = {"city": "New York", "job": "Software Engineer"}

my_dict3 = {**my_dict1, **my_dict2}

my_dict_copy = my_dict.copy()

sorted_dict = dict(sorted(my_dict.items(), key=lambda item: item[1]))