Python, List of Lists

Question

I am currently having a problem, I'm wanting to add things to a list of list whilst creating the list of lists at the same time, for example here

Temp=[]
for j in range 10:
 for i in range 3:
 if j>1:
 Temp.append(i, i+1)

but this is giving me an error.

the output that i am looking for would be in the examples case [[0, 1][1,2][2,3]]

• Łukasz Rogalski: You may append only one object. If you want to append a list, create it and pass it as a argument - Temp.append([i, i+1]).

Answer 1

This will work: temp = [[i, i+1] for i in range(3)]

• Adam: let me give a better example
• Jan Vlcinsky: @Adam: this is very good example. Take your time to learn some examples of list comprehension and you will soon find it really nice.

Answer 2

To fix your solution, just add [brackets] around the list:

Temp=[]
for i in range(3):
 Temp.append([i, i+1])

If you don't mind tuples, consider this instead:

>>> zip(range(0,3), range(1,4))
[(0, 1), (1, 2), (2, 3)]