**kwargs 在 Python 中有什么用途?
我知道您可以在表上执行 objects.filter 并传入 **kwargs 参数.
我也可以这样做来指定时间增量,即 timedelta(hours = time1)?
它究竟是如何工作的?它是拆包"类吗?像a,b=1,2?
解决方案您可以使用 **kwargs 让您的函数接受任意数量的关键字参数(kwargs"的意思是关键字参数"):
>>>def print_keyword_args(**kwargs):... # kwargs 是传递给函数的关键字 args 的字典...对于键,kwargs.iteritems() 中的值:...打印%s = %s"% (核心价值)...>>>print_keyword_args(first_name=John",last_name=Doe")名字 = 约翰姓氏 = 母鹿您还可以在调用函数时使用 **kwargs 语法,方法是构建关键字参数字典并将其传递给您的函数:
>>>kwargs = {'first_name': 'Bobby', 'last_name': 'Smith'}>>>print_keyword_args(**kwargs)名字 = 鲍比姓氏 = 史密斯Python 教程 很好地解释了它的工作原理,以及一些不错的例子.
Python 3 更新对于 Python 3,使用 iteritems()"noreferrer">items()
What are the uses for **kwargs in Python?
I know you can do an objects.filter on a table and pass in a **kwargs argument.
Can I also do this for specifying time deltas i.e. timedelta(hours = time1)?
How exactly does it work? Is it classes as 'unpacking'? Like a,b=1,2?
解决方案You can use **kwargs to let your functions take an arbitrary number of keyword arguments ("kwargs" means "keyword arguments"):
>>> def print_keyword_args(**kwargs): ... # kwargs is a dict of the keyword args passed to the function ... for key, value in kwargs.iteritems(): ... print "%s = %s" % (key, value) ... >>> print_keyword_args(first_name="John", last_name="Doe") first_name = John last_name = DoeYou can also use the **kwargs syntax when calling functions by constructing a dictionary of keyword arguments and passing it to your function:
>>> kwargs = {'first_name': 'Bobby', 'last_name': 'Smith'} >>> print_keyword_args(**kwargs) first_name = Bobby last_name = SmithThe Python Tutorial contains a good explanation of how it works, along with some nice examples.
Python 3 updateFor Python 3, instead of iteritems(), use items()
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**kwargs 的目的和用途是什么?
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