请分析一下哪个可读性好， a) dict(fast=256*1000, food=3*10) b) dict([ ('fast', 256*1000), ('food', 3*10) ])

比较菜，今天自己打一遍代码前，不知道 dict 还能做这种类似 **kwargs 的初始化。

请问 a, b 这 2 种写法，

• 哪种可读性更好？
• 哪种是 dict 初始化的 preferably only one ？

好吧，还是我知识面比较狭窄，确实应该抽空再看看 docs.python.org

https://docs.python.org/3.1/tutorial/datastructures.html

The dict() constructor builds dictionaries directly from sequences of key-value pairs:

>>> dict([('sape', 4139), ('guido', 4127), ('jack', 4098)])
{'sape': 4139, 'jack': 4098, 'guido': 4127}
In addition, dict comprehensions can be used to create dictionaries from arbitrary key and value expressions:

>>> {x: x**2 for x in (2, 4, 6)}
{2: 4, 4: 16, 6: 36}
When the keys are simple strings, it is sometimes easier to specify pairs using keyword arguments:

>>> dict(sape=4139, guido=4127, jack=4098)
{'sape': 4139, 'jack': 4098, 'guido': 4127}