Get All Pairwise Combinations from a List in Python

When it is required to get all pairwise combinations from a list, an iteration along with the ‘append’ method is used.

Example

Below is a demonstration of the same

my_list = [15,"John", 2, "Will", 53, 'Rob']

print("The list is :")
print(my_list)

my_result = []

for i in range(0,len(my_list)):
   for j in range(0,len(my_list)):

      if (i!=j):
         my_result.append((my_list[i],my_list[j]))

print("The result is :")
print(my_result)

Output

The list is :
[15, 'John', 2, 'Will', 53, 'Rob']
The result is :
[(15, 'John'), (15, 2), (15, 'Will'), (15, 53), (15, 'Rob'), ('John', 15), ('John', 2), ('John', 'Will'), ('John', 53), ('John', 'Rob'), (2, 15), (2, 'John'), (2, 'Will'), (2, 53), (2, 'Rob'), ('Will', 15), ('Will', 'John'), ('Will', 2), ('Will', 53), ('Will', 'Rob'), (53, 15), (53, 'John'), (53, 2), (53, 'Will'), (53, 'Rob'), ('Rob', 15), ('Rob', 'John'), ('Rob', 2), ('Rob', 'Will'), ('Rob', 53)]

Explanation

• A list is defined and is displayed on the console.

• An empty list is defined.

• The original list is iterated over, and again iterated over using two iterations in all.

• When both the indices are not equal, the respective elements of the list are appended to the empty list.

• This is the result which is displayed as output on the console.