Example 1: Using zip (Python 3+)
list_1 = [1, 2, 3, 4]
list_2 = ['a', 'b', 'c']
for i, j in zip(list_1, list_2):
print(i, j)
Output
1 a 2 b 3 c
Using zip() method, you can iterate through two lists parallel as shown above.
The loop runs until the shorter list stops (unless other conditions are passed).
Example 2: Using itertools (Python 2+)
import itertools
list_1 = [1, 2, 3, 4]
list_2 = ['a', 'b', 'c']
# 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
1 a 2 b 3 c 1 a 2 b 3 c 4 None
Using the zip_longest() method of itertools module, you can iterate through two parallel lists at the same time. The method lets the loop run until the longest list stops.