How to get Subtraction of tuples in Python

When you need to subtract corresponding elements of two tuples in Python, you can use the map() function with a lambda expression. This approach applies element-wise subtraction and returns a new tuple with the results.

The map() function applies a given function to every item in an iterable (such as list, tuple). It returns a map object that can be converted to a tuple.

A lambda function is an anonymous function defined without a name. Unlike regular functions defined with def, lambda functions are defined using the lambda keyword and can take any number of arguments but contain only a single expression.

Basic Tuple Subtraction

Here's how to subtract corresponding elements from two tuples ?

my_tuple_1 = (7, 8, 11, 0, 3, 4)
my_tuple_2 = (3, 2, 22, 45, 12, 9)

print("The first tuple is:")
print(my_tuple_1)
print("The second tuple is:")
print(my_tuple_2)

my_result = tuple(map(lambda i, j: i - j, my_tuple_1, my_tuple_2))

print("The tuple after subtraction is:")
print(my_result)

The first tuple is:
(7, 8, 11, 0, 3, 4)
The second tuple is:
(3, 2, 22, 45, 12, 9)
The tuple after subtraction is:
(4, 6, -11, -45, -9, -5)

How It Works

The process works as follows:

• The lambda i, j: i - j function takes two arguments and returns their difference
• map() applies this lambda function to corresponding elements of both tuples
• tuple() converts the map object back to a tuple
• Each element at index n in the result equals tuple_1[n] - tuple_2[n]

Alternative Approach Using Zip

You can also use zip() with tuple comprehension for the same result ?

tuple_1 = (10, 20, 30, 40)
tuple_2 = (5, 8, 12, 15)

result = tuple(a - b for a, b in zip(tuple_1, tuple_2))

print("Original tuples:", tuple_1, "and", tuple_2)
print("After subtraction:", result)

Original tuples: (10, 20, 30, 40) and (5, 8, 12, 15)
After subtraction: (5, 12, 18, 25)

Comparison

Conclusion

Use map() with lambda for functional programming style tuple subtraction. The zip() with tuple comprehension approach offers better readability for the same element-wise subtraction operation.