Concatenate and Merge lists
suggest change- The simplest way to concatenate
list1
andlist2
:merged = list1 + list2
zip
returns a list of tuples, where the i-th tuple contains the i-th element from each of the argument sequences or iterables:alist = ['a1', 'a2', 'a3'] blist = ['b1', 'b2', 'b3'] for a, b in zip(alist, blist): print(a, b) # Output: # a1 b1 # a2 b2 # a3 b3
If the lists have different lengths then the result will include only as many elements as the shortest one:
alist = ['a1', 'a2', 'a3'] blist = ['b1', 'b2', 'b3', 'b4'] for a, b in zip(alist, blist): print(a, b) # Output: # a1 b1 # a2 b2 # a3 b3 alist = [] len(list(zip(alist, blist))) # Output: # 0 For padding lists of unequal length to the longest one with `None`s use `itertools.zip_longest` (`itertools.izip_longest` in Python 2) alist = ['a1', 'a2', 'a3'] blist = ['b1'] clist = ['c1', 'c2', 'c3', 'c4'] for a,b,c in itertools.zip_longest(alist, blist, clist): print(a, b, c) # Output: # a1 b1 c1 # a2 None c2 # a3 None c3 # None None c4
- Insert to a specific index values:
alist = [123, 'xyz', 'zara', 'abc'] alist.insert(3, [2009]) print("Final List :", alist)
Output:
Final List : [123, 'xyz', 'zara', 2009, 'abc']
Found a mistake? Have a question or improvement idea?
Let me know.
Table Of Contents