fromkeys () is a class method that returns a new dictionary. value defaults to None. All of the values refer to just a single instance, so it generally doesn’t make sense for value to be a mutable ...

Python 字典(Dictionary) fromkeys() 函数用于创建一个新字典，以序列seq中元素做字典的键，value为字典所有键对应的初始值。 #!/usr ...