How to I append elements to a list of lists in python
Question:
I’ve a list of lists like:
a = [[1,2], [3,4]]
To each of the lists I want to add an element like 0 at the beginning, so that the result looks like:
b = [[0,1,2], [0,3,4]]
What’s the Python way to do it? I already tried it with "map", but without success.
I know, I could easily do it with a loop, but what’s the functional way?
Answers:
Use list comprehension and addition of lists to get in done in one short line of code:
b = [[0]+item for item in a]
I’ve a list of lists like:
a = [[1,2], [3,4]]
To each of the lists I want to add an element like 0 at the beginning, so that the result looks like:
b = [[0,1,2], [0,3,4]]
What’s the Python way to do it? I already tried it with "map", but without success.
I know, I could easily do it with a loop, but what’s the functional way?
Use list comprehension and addition of lists to get in done in one short line of code:
b = [[0]+item for item in a]