eager_eagle , 3 days ago

List comprehensions return a new list. For the sake of code clarity, you probably shouldn't change a second list from within a list comprehension. If you're trying to concatenate two lists, you can do so in a second line:

a = list(range(10))
b = [ value for value in range(5) ]
a.extend(b)

# a has 15 elements
print(a)