Python program to find Tuples with positive elements in List of tuples

When it is required to find tuples that have positive elements from a list of tuples, list comprehension along with the all() function can be used. This approach checks if all elements in each tuple are non-negative.

Syntax

result = [tuple for tuple in list_of_tuples if all(element >= 0 for element in tuple)]

Example

The following example demonstrates how to filter tuples containing only positive elements ?

my_list = [(56, 43), (-31, 21, 23), (51, -65, 26), (24, 56)]

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

my_result = [sub for sub in my_list if all(elem >= 0 for elem in sub)]

print("The tuples with positive elements are:")
print(my_result)

Output

The list is:
[(56, 43), (-31, 21, 23), (51, -65, 26), (24, 56)]
The tuples with positive elements are:
[(56, 43), (24, 56)]

How It Works

• The all() function returns True if all elements in an iterable are True (or non-zero)

• List comprehension iterates through each tuple in the original list

• For each tuple, all(elem >= 0 for elem in sub) checks if every element is non-negative

• Only tuples where all elements pass the condition are included in the result

Alternative Method Using filter()

You can also use the filter() function with a lambda expression ?

my_list = [(56, 43), (-31, 21, 23), (51, -65, 26), (24, 56)]

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

my_result = list(filter(lambda x: all(elem >= 0 for elem in x), my_list))

print("The tuples with positive elements are:")
print(my_result)

Output

The list is:
[(56, 43), (-31, 21, 23), (51, -65, 26), (24, 56)]
The tuples with positive elements are:
[(56, 43), (24, 56)]

Conclusion

Use list comprehension with all() function to efficiently filter tuples containing only positive elements. The filter() method provides an alternative functional programming approach for the same task.