What is 最Pythonic的方式解决以下问题?从交互式 shell 中:
>>> def f(a=False):
... if a:
... return 'a was True'
... return 'a was False'
...
>>> f(a=True)
'a was True'
>>> kw = 'a'
>>> val = True
>>> f(kw=val)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: f() got an unexpected keyword argument 'kw'
目前我正在通过以下方法解决这个问题:
>>> exec 'result = f(%s=val)' % kw
>>> result
'a was True'
但看起来很笨拙......
(python 2.7+或3.2+解决方案都可以)
Use 关键字参数解包 http://docs.python.org/tutorial/controlflow.html#keyword-arguments:
>>> kw = {'a': True}
>>> f(**kw)
<<< 'a was True'
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