Python – Filter Strings within ASCII range

Given ASCII or alphabetical range, filter strings found in particular range.

Input : test_list = [“gfg”, “is”, “best”, “for”, “geeks”], strt_asc, end_asc = 105, 115 
Output : [‘is’] 
Explanation : i has 105, and s has 115, which is in range ASCII values.
Input : test_list = [“gfg”, “is”, “best”, “for”, “geeks”], strt_asc, end_asc = 100, 115 
Output : [‘gfg’, ‘is’, ‘for’, ‘geeks’] 
Explanation : Strings with range characters included. 

Method #1 : Using list comprehension + all() + ord()

In this, we check for all characters to be in given ASCII range, computed using ord(), and accordingly, strings are filtered.

Python3

# Python3 code to demonstrate working of
# Filter Strings within ASCII range
# Using list comprehension + ord() + all()

# initializing list
test_list = ["gfg", "is", "best", "for", "geeks"]

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

# initializing ASCII range
strt_asc, end_asc = 105, 115

# checking for all characters to be in ASCII range
res = [sub for sub in test_list if all(
    ord(ele) >= strt_asc and ord(ele) <= end_asc for ele in sub)]

# printing result
print("Filtered Strings : " + str(res))

Output

The original list is : ['gfg', 'is', 'best', 'for', 'geeks']
Filtered Strings : ['is']

Time Complexity: O(n) where n is the number of elements in the list “test_list”.  
Auxiliary Space: O(1), no extra space is required

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

In this, we perform task of filtering using filter() and lambda function, ord() and all() is used in similar way as above method.

Python3

# Python3 code to demonstrate working of
# Filter Strings within ASCII range
# Using filter() + lambda + all() + ord()

# initializing list
test_list = ["gfg", "is", "best", "for", "geeks"]

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

# initializing ASCII range
strt_asc, end_asc = 105, 115

# checking for all characters to be in ASCII range
res = list(filter(lambda sub: all(ord(ele) >= strt_asc and ord(
    ele) <= end_asc for ele in sub), test_list))

# printing result
print("Filtered Strings : " + str(res))

Output

The original list is : ['gfg', 'is', 'best', 'for', 'geeks']
Filtered Strings : ['is']

Time Complexity: O(n*n)
Auxiliary Space: O(1)