Python - Check if List contains elements in Range

Checking if a list contains elements within a specific range is a common problem. In this article, we will various approaches to test if elements of a list fall within a given range in Python. Let's start with a simple method to Test whether a list contains elements in a range.

Using any() Function - Efficient

any() function is optimized for Checking that if a contains elements in Range it stops as soon as a match is found.

a = [3, 8, 12, 18, 25]

#Define the range
start, end = 10, 20

# Check if any element in the list is in the range
in_range = any(start <= num <= end for num in a)

print(in_range)

True

Using List Comprehension

By using a list comprehension can check if all elements are within the range by creating a list of (True or False) values for each element, then checking if all values are True.

a = [5, 10, 15, 20]

#Define the range
start = 5
end = 20

# Check if all elements are within the range 
#using list comprehension
in_range = all(start <= num <= end for num in a)
print(in_range)

True

Using map() and all()

Another way to do this is by using map() to apply the range condition to each element, followed by all() to check if all conditions are True.

a = [5, 10, 15, 20]

#Define the range
start = 5
end = 20

# Use `map` to apply a lambda function to each element in the list
# `all` ensures that all elements in the list satisfy the range condition
in_range = all(map(lambda num: start <= num <= end, a))
print(in_range)

True

• map() applies the condition start <= num <= end to each number in the list lst.
• all() function checks if all values in the list generated by the comprehension (start <= num <= end) are True. If any value is False, it will return False. If all values are True, it returns True.

Note: This method is slower than List comprehension, because of overhead of using map() and lambda.

Using for loop

The simplest way to check if a List contains elements in Range is by using a for loop. We can loop through each element and check if it is inside the range we are looking for.

a = [10, 20, 30, 40, 50]

# Set the range
low = 15
high = 35

# Check if any element is within the range
in_range = True
for elem in a:
    if low <= elem <= high:
        in_range = False
        break

print(in_range)

False