Python Combinations of Two List Without Repetition

Need to combine two or more lists into tuples? Use zip()!

1: Pairing Two Lists

names = ["Alice", "Bob", "Charlie"]  
ages = [25, 30, 35]  

merged = list(zip(names, ages))  
print(merged)  

Output:

[('Alice', 25), ('Bob', 30), ('Charlie', 35)]  

2: Handling Unequal Lengths

By default, zip() stops at the shortest list. Use itertools.zip_longest to fill missing values:

from itertools import zip_longest  

list1 = [1, 2, 3]  
list2 = ['a', 'b']  

merged = list(zip_longest(list1, list2, fillvalue=None))  
print(merged)  

Output:

[(1, 'a'), (2, 'b'), (3, None)]  

3: All combinations of elements of 2 lists

import itertools
a = ["banana", "melon"]
b = [1, 2, 3]
c = list(itertools.product(a, b))
c

result:

[('banana', 1),
 ('banana', 2),
 ('banana', 3),
 ('melon', 1),
 ('melon', 2),
 ('melon', 3)]

4. List comprehension

[(x,y) for x in a for y in b]

result:

[('banana', 1),
 ('banana', 2),
 ('banana', 3),
 ('melon', 1),
 ('melon', 2),
 ('melon', 3)]

5. List of Tuples

import itertools
list1=['a','b','c']
list2=[1,2]

[list(zip(x,a)) for x in itertools.permutations(b,len(a))]

result:

 [[(1, 'banana'), (2, 'melon')],
 [(1, 'banana'), (3, 'melon')],
 [(2, 'banana'), (1, 'melon')],
 [(2, 'banana'), (3, 'melon')],
 [(3, 'banana'), (1, 'melon')],
 [(3, 'banana'), (2, 'melon')]]

Permutations or combinations?

Here as an excerpt from the Python docs on itertools That might help you find what your looking for: