[英]passing arguments to a function using kwargs - Python
I have the following code snippet: 我有以下代码片段:
kwargs = {'inventory_file' : self.inventory_file}
for ts in self.test_sets_list:
current_ts = TestSet(name=ts,
test_cases=self.test_sets_list[ts],
om_ip_address=self.om_ip_address,
**kwargs)
class TestSet(object):
def __init__(self, name, test_cases, om_ip_address, **kwargs):
class TestCase(object):
def __init__(self, parameters, config_file, test_failure,
om_ip_address, **kwargs):
I know I'm probably doing wrong, because in **kwargs
I'm unpacking the values in kwargs
. 我知道我可能做错了,因为在
**kwargs
我在拆箱值kwargs
。 What I want is to pass the arguments of kwargs
all the way to TestCase
. 我想要的是将
kwargs
的参数一直传递给TestCase
。 Inside TestSet
I'm trying to pass the kwargs
argument: 在
TestSet
内部,我试图传递kwargs
参数:
instance = TestCase(parameters=params,
config_file=cnf,
om_ip_address=om_ip_address,
**kwargs)
However I'm getting the following error: 但是我收到以下错误:
Traceback (most recent call last):
File "main.py", line 258, in <module>
main(args)
File "main.py", line 217, in main
operation.collect_tests()
File "main.py", line 157, in collect_tests
**kwargs)
File "test_set.py", line 47, in __init__
self.__instantiate_module(tc, om_ip_address)
File "test_set.py", line 78, in __instantiate_module
**self.kwargs)
TypeError: __init__() got an unexpected keyword argument 'inventory_file
The class is instantiated via: 该类通过以下方式实例化:
my_class = getattr(module, test_cases['name'])
instance = my_class(parameters=params,
config_file=cnf,
om_ip_address=om_ip_address)
How can I be able to pass kwargs
all the way to TestCase
? 如何将
kwargs
一直传递给TestCase
?
Calling a function with **kwargs
, where kwargs = {'inventory_file' : self.inventory_file}
is the same as calling 用
**kwargs
调用函数,其中kwargs = {'inventory_file' : self.inventory_file}
与调用相同
function(inventory_file=self.inventory_file)
and if the definition of function
doesn't have inventory_file in the accepted params list, it will throw the error you got there. 并且如果
function
的定义在接受的参数列表中没有清单文件,它将抛出您到达的错误。 Two ways to solve this: 解决此问题的两种方法:
class TestCase(object):
# add inventory_file to the params list with a default value
def __init__(self, parameters, config_file, test_failure,
om_ip_address, inventory_file=None, **kwargs):
self.inventory_file = inventory_file
or: 要么:
class TestCase(object):
# check for the inventory file in the kwargs dict
def __init__(self, parameters, config_file, test_failure,
om_ip_address, **kwargs):
if 'inventory_file' in kwargs:
self.inventory_file = kwargs['inventory_file']
and in both cases: 在两种情况下:
>>> t = TestCase('param1','param2','param3','param4', **{'inventory_file':'file'})
>>> t.inventory_file
'file'
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.