This question already has answers here:
Converting Python dict to kwargs?
(3 answers)
Closed 5 years ago.
I want to build a query for sunburnt(solr interface) using class inheritance and therefore adding key - value pairs together. The sunburnt interface takes keyword arguments. How can I transform a dict ({'type':'Event'}) into keyword arguments (type='Event')?
You can do this using dictionary unpacking:
dct = dict({'type':'Event'})
# equivalent to func(type='Event')
func(**dct)
Related
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Is there a simple way of having a python list containing a given type of object only
(2 answers)
Python Typed Array of a Certain Size
(2 answers)
Closed 27 days ago.
I am trying to initialize a list object in python that accepts only one data type, let's say that I want to make a list of integers in c++, I would write int list[] = {1,2,3};, what is the python equivalent of this?
This question already has answers here:
How to extract parameters from a list and pass them to a function call [duplicate]
(3 answers)
How to split list and pass them as separate parameter?
(4 answers)
Closed 1 year ago.
Assuming i have a method definition like this do_stuff(*arg).
I have a list of values, ['a','b',...]. How best can i pass the values of this list as individual arguments to the do_stuff method as do_stuff('a','b',...) ?
I've unsuccessfully tried using list comprehension - do_stuff([str(value) for value in some_list])
I am hoping i don't have to change do_stuff() to accept a list
Any pointers would be appreciated.
You can pass them using the "*" operator. So an example would be like this:
def multiplyfouritems(a,b,c,d):
return a*b*c*d
multiplyfouritems(*[1,2,3,4])
It's the same syntax, with the *:
do_stuff(*['a','b','c'])
This question already has answers here:
What algorithm does Python's built-in sort() method use?
(2 answers)
What is `lambda` in Python code? How does it work with `key` arguments to `sorted`, `sum` etc.?
(4 answers)
Understanding the map function
(6 answers)
Closed 1 year ago.
I found the following line of code which I'm unable to google as it has a custom function. Can someone please explain this?
list.sort(key=lambda v: map(int, v.split('.')))
I know this sorts a list but I want to understand which sort is it and how it works.
This question already has answers here:
Expanding tuples into arguments
(5 answers)
Closed 8 months ago.
If I have a function:
def run(time, message, time_span_pattern):
...
And a list like:
run_args = ['1s', '1 second alarm', <_sre.SRE_Pattern object at 0x100435680>]
How can I pass the list, as separate arguments, to run? Is there a builtin way to do this, or am I forced to reference each element individually and by index?
You're looking for:
run(*run_args)
This is explained in more detail in this StackOverflow answer about the star and double star operator
It's also covered in the python docs
This question already has answers here:
How can you dynamically create variables? [duplicate]
(8 answers)
Closed 8 years ago.
if one had a list of strings, how could they create variables (empty list objects) with those names?
pre_vars= ['list_1','list_2','list_3']
print list_1,list_2,list_3
>>> [],[],[]
I saw some examples that were similar but they were using classes. Can this be done without using classes?
Use globals():
for name in pre_vars:
globals()[name]= []