Is there any way in Python to give the opposite of each numeral element of a list in one line, without doing, for example:
for i in range(len(L)):
L[i] = -L[i]
Considering the following list:
[0, 1, 2, 3..., 9]
The output should be
[0, -1, -2, -3..., -9]
Every number of the list should be its additive opposite.
-L obviously doesn't work.
I searched but I found only how to reverse a list, and not how to invert its elements (meaning that every number should become its additive inverse).
I know about list comprehensions, but I was wondering if there was a special keyword in Python to achieve this, or to do it in a cleaner way.
If your input values are numeric, you can do something like this
negated_values=map(lambda x:-x, mylist)
where
print(list(negated_values))
returns
[0, -1, -2, -3, -4, -5, -6, -7, -8, -9]