Hey guys, in this blog we will see a Python Program to Iterate Through Two Lists in Parallel.
Example 1: Using zip (Python 3+)
# Python Program to Iterate Through Two Lists in Parallel
list_1 = ['a', 'b', 'c']
list_2 = [1, 2, 3, 4]
for i, j in zip(list_1, list_2):
print(i, j)
Output
a 1 b 2 c 3
- Here we have used the zip method to bind two lists.
- Zipping list_1 and list_2 will create a new list like [(‘a’,1),(‘b’,2),(‘c’,3)].
- Then we are simply traversing in the zipped list and printing elements.
Example 2: Using itertools (Python 2+)
import itertools
list_1 = ['a', 'b', 'c']
list_2 = [1, 2, 3, 4]
# loop until the short loop stops
for i,j in zip(list_1,list_2):
print(i,j)
print("\n")
# loop until the longer list stops
for i,j in itertools.zip_longest(list_1,list_2):
print(i,j)
Output
a 1 b 2 c 3 a 1 b 2 c 3 None 4
- Here also first of all we are using zip.
- In the second example, we are using itertools.zip_longest() which will zip according to the longest list of the 2 provided.
- In the shorter list, it will add None as shown above in the output.
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