自动对Python字典中的值进行解包和赋值

# 示例字典
data = {'a': 1, 'b': 2, 'c': 3}

# 解包字典的键值对
key, value = next(iter(data.items()))
print(key, value)  # 输出: a 1

def func(a, b, c):
    print(a, b, c)

data = {'a': 1, 'b': 2, 'c': 3}
func(**data)  # 输出: 1 2 3

def func(a, b, c):
    print(a, b, c)

data = [1, 2, 3]
func(*data)  # 输出: 1 2 3

def func(a, b, c):
    print(a, b, c)

data = {'a': 1, 'b': 2}
try:
    func(**data)
except TypeError as e:
    print(f"Error: {e}")  # 输出: Error: func() missing 1 required positional argument: 'c'

def func(a, b, c=0):
    print(a, b, c)

data = {'a': 1, 'b': 2}
func(**data)  # 输出: 1 2 0

data = {'a': 1, 'b': 2}
try:
    key, value = data['c']
except KeyError as e:
    print(f"Error: {e}")  # 输出: Error: 'c'

from collections import defaultdict

data = defaultdict(int, {'a': 1, 'b': 2})
key, value = data['c']  # 不会抛出 KeyError，value 默认为 0
print(key, value)  # 输出: c 0

from collections import defaultdict

def safe_unpack(data, keys):
    result = {}
    for key in keys:
        result[key] = data.get(key, None)
    return result

# 示例字典
data = {'a': 1, 'b': 2, 'c': 3}

# 需要解包的键
keys = ['a', 'b', 'd']

# 安全解包
unpacked_data = safe_unpack(data, keys)
print(unpacked_data)  # 输出: {'a': 1, 'b': 2, 'd': None}