1. Description
*,nkw denotes the named keyword parameter, which is the name of the keyword parameter that the user wants to enter, defined by appending *, before nkw.
2. Role
Restricts the names of parameters communicated by the caller.
3. Examples
# Naming keyword parameters
def print_info4(name, age=18, height=178, *, weight, **kwargs):
'''
Print message function 4, add named keyword parameter
:param name.
:param age.
:param height: :param weight: :param
:param weight: :param kwargs: :param
:param kwargs: :return: :param
:return.
'''
print('name: ', name)
print('age: ', age)
print('height: ', height)
print('keyword: ', kwargs)
print('weight: ', weight)
print_info4('robin', 20, 180, birth='2000/02/02', weight=125)
Knowledge Point Expansion:
Keyword parameters
Variable parameters allow you to pass 0 or any number of parameters, which are automatically assembled into a tuple when the function is called, whereas keyword parameters allow you to pass 0 or any number of parameters with parameter names, which are automatically assembled into a dict inside the function.
Shaped as:
>>> def person(name,age,**kw):
print("name:",name,"age:",age,"other:",kw)
>>> person("bbj",23,city="hefei",habit="basketball")
name: bbj age: 23 other: {'city': 'hefei', 'habit': 'basketball'}
>>>
The keyword parameter as I understand it means that you can pass in countless self-named parameters when you call it, and the keyword here means that you name it yourself. All keyword arguments are automatically assembled into a dictionary.
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