keyword-argument

问题 I was checking the documentation of list.index() method in python, what I saw is : >>> help(list().index) Help on built-in function index: index(value, start=0, stop=9223372036854775807, /) method of builtins.list instance Return first index of value. Raises ValueError if the value is not present. When I ran the code below gave me some error. >>> l=[1,2,3,43,45,5,6,6] >>> l.index(43,start=1) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: index() takes no

问题 I was checking the documentation of list.index() method in python, what I saw is : >>> help(list().index) Help on built-in function index: index(value, start=0, stop=9223372036854775807, /) method of builtins.list instance Return first index of value. Raises ValueError if the value is not present. When I ran the code below gave me some error. >>> l=[1,2,3,43,45,5,6,6] >>> l.index(43,start=1) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: index() takes no

问题 I have a functioning event listener and delegate handler like this: def eHandler(source, sym, bid, ask) : qstr = '{} {:.5f} {:.5f}'.format(sym,bid,ask) print(qstr) ... mtc.QuoteUpdated += eHandler However, I suspect the event also provide an object (?) with keywords which I don't know what they are. I have tried to do something like the following, but it doesn't work. def eHandler2(src, *args, **kwargs): k = args print('{} {:.5f} {:.5f}'.format(k.Instrument, k.Bid, k.Ask)) print('src: {}

问题 I want to use both &rest and &key at the same time. However, the attempted code below: (defun test (&rest args &key (name "who")) nil) (test 1 2 3 4 5 :name "hoge") causes an error: *** - TEST: keyword arguments in (1 2 3 4 5 :NAME "hoge") should occur pairwise and when I gives only keyword parameter like (test :name "hoge") , it works. Is it possible to use both &rest and &key? 回答1: It's generally not a good idea to mix rest parameters with keyword parameters within a function definition in

问题 I want to use both &rest and &key at the same time. However, the attempted code below: (defun test (&rest args &key (name "who")) nil) (test 1 2 3 4 5 :name "hoge") causes an error: *** - TEST: keyword arguments in (1 2 3 4 5 :NAME "hoge") should occur pairwise and when I gives only keyword parameter like (test :name "hoge") , it works. Is it possible to use both &rest and &key? 回答1: It's generally not a good idea to mix rest parameters with keyword parameters within a function definition in

问题 I want to use both &rest and &key at the same time. However, the attempted code below: (defun test (&rest args &key (name "who")) nil) (test 1 2 3 4 5 :name "hoge") causes an error: *** - TEST: keyword arguments in (1 2 3 4 5 :NAME "hoge") should occur pairwise and when I gives only keyword parameter like (test :name "hoge") , it works. Is it possible to use both &rest and &key? 回答1: It's generally not a good idea to mix rest parameters with keyword parameters within a function definition in

问题 I want to use both &rest and &key at the same time. However, the attempted code below: (defun test (&rest args &key (name "who")) nil) (test 1 2 3 4 5 :name "hoge") causes an error: *** - TEST: keyword arguments in (1 2 3 4 5 :NAME "hoge") should occur pairwise and when I gives only keyword parameter like (test :name "hoge") , it works. Is it possible to use both &rest and &key? 回答1: It's generally not a good idea to mix rest parameters with keyword parameters within a function definition in

问题 Here is a simple example of using keyword arguments in a function call. Nothing special. def foo(arg1,arg2, **args): print arg1, arg2 print (args) print args['x'] args ={'x':2, 'y':3} foo(1,2,**args) Which prints, as expected: 1 2 {'y': 3, 'x': 2} 2 I am trying to pass the same style keyword arguments to a multiprocessing task, but the use of **, in the args list is a syntax error. I know that my function, stretch() will take two positional arguments and n keyword arguments. pool =

问题 Im trying to import some data from a csv file to a django database using django-import-export, with a foreign key (location). What I want to achieve is, that the location_id is passed by the request url. value,datetime,location 4.46,2020-01-01,1 4.46,2020-01-02,1 My urls look like this, so I want "location_id" to be passed into the uploaded csv file: urlpatterns = [ ... ... path('..../<int:location_id>/upload', views.simple_upload, name='upload'), ] My view looks like this: def simple_upload

问题 Im trying to import some data from a csv file to a django database using django-import-export, with a foreign key (location). What I want to achieve is, that the location_id is passed by the request url. value,datetime,location 4.46,2020-01-01,1 4.46,2020-01-02,1 My urls look like this, so I want "location_id" to be passed into the uploaded csv file: urlpatterns = [ ... ... path('..../<int:location_id>/upload', views.simple_upload, name='upload'), ] My view looks like this: def simple_upload