Python - Extract tuples with elements in Range

Given list of tuples, extract tuples having elements in range.

Input : test_list = [(4, 5, 7), (5, 6), (3, 8, 10 ), (4, 10)], strt, end = 5, 6 Output : [(5, 6)] Explanation : Only 1 tuple lies in range of 5-6. Input : test_list = [(4, 5, 7), (5, 6), (3, 8, 10 ), (4, 10)], strt, end = 1, 10 Output : [(4, 5, 7), (5, 6), (3, 8, 10 ), (4, 10)] Explanation : All lie in specified range.

Method #1 : Using list comprehension + all()

In this, we check for all elements in range using comparison operator and all() returns true for tuples that contain tuples in range specified.

# Python3 code to demonstrate working of 
# Extract tuples with elements in Range
# Using all() + list comprehension

# initializing list
test_list = [(4, 5, 7), (5, 6), (3, 8, 10 ), (4, 10)]

# printing original list
print("The original list is : " + str(test_list))

# initializing range 
strt, end = 4, 7

# list comprehension to encapsulate in 1 liner 
# all() checks for all elements in range 
res = [sub for sub in test_list if all(ele >= strt and ele <= end for ele in sub)]
        
# printing results
print("Filtered tuples : " + str(res))

The original list is : [(4, 5, 7), (5, 6), (3, 8, 10), (4, 10)]
Filtered tuples : [(4, 5, 7), (5, 6)]

Time Complexity: O(n), where n is the length of the input list. 
Auxiliary Space: O(n) additional space of size n is created where n is the number of elements in the list “test_list”. 

Method #2 : Using filter() + lambda + all() 

In this, we employ filter() to extract out tuples, according to function provided by lambda, and all() as utility to test for all elements in range tuple.

# Python3 code to demonstrate working of 
# Extract tuples with elements in Range
# Using filter() + lambda + all() 

# initializing list
test_list = [(4, 5, 7), (5, 6), (3, 8, 10 ), (4, 10)]

# printing original list
print("The original list is : " + str(test_list))

# initializing range 
strt, end = 4, 7

# list() to get back result as list  
# all() checks for all elements in range 
res = list(filter(lambda sub : all(ele >= strt and ele <= end for ele in sub), test_list))
        
# printing results
print("Filtered tuples : " + str(res))

The original list is : [(4, 5, 7), (5, 6), (3, 8, 10), (4, 10)]
Filtered tuples : [(4, 5, 7), (5, 6)]

Method 3 : using a for loop

1. Initialize a list of tuples test_list with some sample data.
2. Define the range of values we want to extract from the tuples as strt and end.
3. Create an empty list res to store the filtered tuples.
4. Use a for loop to iterate through each tuple in test_list.
5. Within the for loop, use the all() function to check if all elements in the current tuple are within the given range.
6. If all elements are within the range, append the tuple to res.
7. After the loop has finished iterating through all tuples, print the filtered tuples in res.

# initializing list
test_list = [(4, 5, 7), (5, 6), (3, 8, 10 ), (4, 10)]

# initializing range 
strt, end = 4, 7

# initializing an empty list to store the filtered tuples
res = []

# iterating through each tuple in the list
for tup in test_list:
    # checking if all elements of the tuple are within the range
    if all(strt <= ele <= end for ele in tup):
        # if yes, adding the tuple to the result list
        res.append(tup)

# printing results
print("Filtered tuples : " + str(res))

Filtered tuples : [(4, 5, 7), (5, 6)]

The time complexity of this approach is O(n*m), where n is the number of tuples in the list and m is the number of elements in each tuple. 

The space complexity is O(k), where k is the number of tuples that satisfy the condition.

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Article Tags :

• Python
• Python Programs
• Python list-programs

Practice Tags :

• python