Combine two lists into one multidimensional list
Question:
I would like to merge two lists into one 2d list.
list1=["Peter", "Mark", "John"]
list2=[1,2,3]
into
list3=[["Peter",1],["Mark",2],["John",3]]
Answers:
list3 = [list(a) for a in zip(list1, list2)]
An alternative:
>>> map(list,zip(list1,list2))
[['Peter', 1], ['Mark', 2], ['John', 3]]
or in python3:
>>> list(map(list,zip(list1,list2)))
[['Peter', 1], ['Mark', 2], ['John', 3]]
(you can omit the outer list()-cast in most circumstances, though)
I actually used:
list3a = np.concatenate((list1, list2))
list3 = np.reshape(list3a, (-1,2))
because otherwise I get the error: ‘list indices must be integers, not tuples’ when trying to reference the array.
zip() iterates over both lists in sync and you will get a and b in parallel. Both values then create a new list as an element of the final list (list3).
list3 = [[a, b] for a, b in zip(list1, list2)]
I would like to merge two lists into one 2d list.
list1=["Peter", "Mark", "John"]
list2=[1,2,3]
into
list3=[["Peter",1],["Mark",2],["John",3]]
list3 = [list(a) for a in zip(list1, list2)]
An alternative:
>>> map(list,zip(list1,list2))
[['Peter', 1], ['Mark', 2], ['John', 3]]
or in python3:
>>> list(map(list,zip(list1,list2)))
[['Peter', 1], ['Mark', 2], ['John', 3]]
(you can omit the outer list()-cast in most circumstances, though)
I actually used:
list3a = np.concatenate((list1, list2))
list3 = np.reshape(list3a, (-1,2))
because otherwise I get the error: ‘list indices must be integers, not tuples’ when trying to reference the array.
zip() iterates over both lists in sync and you will get a and b in parallel. Both values then create a new list as an element of the final list (list3).
list3 = [[a, b] for a, b in zip(list1, list2)]