Python – Extract tuples with elements in Range

When working with tuples in Python, you may need to extract only those tuples where all elements fall within a specific range. This can be accomplished using the filter() function combined with lambda expressions and the all() function.

Syntax

The general approach uses this pattern ?

filtered_tuples = list(filter(lambda tuple: all(start <= element <= end for element in tuple), tuple_list))

Example

Let's extract tuples where all elements are between 13 and 22 (inclusive) ?

my_list = [(13, 15, 17), (25, 56), (13, 21, 19), (44, 14)]

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

beg, end = 13, 22

my_result = list(filter(lambda sub: all(element >= beg and element <= end for element in sub),
                       my_list))

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

The list is:
[(13, 15, 17), (25, 56), (13, 21, 19), (44, 14)]
The result is:
[(13, 15, 17), (13, 21, 19)]

How It Works

The solution breaks down into these components:

• Lambda function: Creates an anonymous function that takes a tuple as input

• all() function: Returns True only if all elements in the tuple satisfy the condition

• Generator expression: Checks each element against the range condition

• filter() function: Applies the lambda function to each tuple and keeps only those that return True

Alternative Approach Using List Comprehension

You can achieve the same result using list comprehension ?

my_list = [(13, 15, 17), (25, 56), (13, 21, 19), (44, 14)]
beg, end = 13, 22

# Using list comprehension
result = [tup for tup in my_list if all(beg <= element <= end for element in tup)]

print("Result using list comprehension:")
print(result)

Result using list comprehension:
[(13, 15, 17), (13, 21, 19)]

Comparison

Conclusion

Use filter() with lambda and all() to extract tuples where all elements fall within a specified range. List comprehension offers a more readable alternative with similar functionality.