How can I write this code in one-line?
aa = []
for s in complete:
aa.append(s)
I know there are several solutions. I would really appreciate if you could write them down. Thanks!
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6 Answers
like this (be care with strings):
aa.extend(complete)
or with list comprehension:
aa = list(s for s in complete)
or if u want to copy list u can do follow:
aa = complete[:]
aa = complete.copy() # same
aa = list(complete) # same
or just use '+':
aa += complete
Comments
List comprehensions are awesome:
aa = [s for s in complete]
4 Comments
John Smith
Thanks, was so close I had:
aa = [for s in complete]
Vaibhav Bajaj
This does not append complete. Why not simply do
aa = complete
joaquinlpereyra
@JohnSmith That's a syntax error, though. I find the [x for x in list] syntax somewhat awkward, seems redundant, but it makes sense when you want to add some logic to it: sayings = [country.saying for country in list_of_countries]
joaquinlpereyra
@VaibhavBajaj as the title of the questions suggests, I assume he wants to add values from a list to another. That's not exactly the same: he may want to add logic to 'filter' some values. But that's speculation on my part.
As long as you just need to set aa equal to complete, just use
aa = complete
Comments
I like to do such things with a list comprehension:
aa = [s for s in complete]
Though, depending on the type of complete, and whether or not you want to use package like numpy there may be a faster way, such as
import numpy as np
aa = np.array(complete)
I'm sure there are many other ways as well :)
Comments
If you want to add values to array in one line, it depends how the values are given. If you have another list, you can also use extend:
my_list = []
my_list.extend([1,2,3,4])
Comments
To extend aa, use the extend() function:
aa.extend(s for s in complete)
or
aa.extend(complete)
If you simply wanted to equate the two, a simple = is fine:
aa = complete
