Python – Filter above Threshold size Strings

Last Updated : 31 Dec, 2019

Sometimes, while working with huge amount of data, we can have a problem in which we need to extract just specific sized strings above a minimum threshold. This kind of problem can occur during validation cases across many domains. Let’s discuss certain ways to handle this in Python strings list.

Method #1 : Using list comprehension + len()
The combination of above functionalities can be used to perform this task. In this, we iterate for all the strings and return only above threshold strings checked using len().

# Python3 code to demonstrate working of
# Filter above Threshold size Strings
# using list comprehension + len()
  
# initialize list 
test_list = ['gfg', 'is', 'best', 'for', 'geeks']
  
# printing original list 
print("The original list : " + str(test_list))
  
# initialize Threshold
thres = 4
  
# Filter above Threshold size Strings
# using list comprehension + len()
res = [ele for ele in test_list if len(ele) >= thres]
  
# printing result
print("The above Threshold size strings are : " + str(res))

Output :

The original list : ['gfg', 'is', 'best', 'for', 'geeks']
The above Threshold size strings are : ['best', 'geeks']

Method #2 : Using filter() + lambda
The combination of above functionalities can be used to perform this task. In this, we extract the elements using filter() and logic is compiled in a lambda function.

# Python3 code to demonstrate working of
# Filter above Threshold size Strings
# using filter() + lambda
  
# initialize list 
test_list = ['gfg', 'is', 'best', 'for', 'geeks']
  
# printing original list 
print("The original list : " + str(test_list))
  
# initialize Threshold
thres = 4
  
# Filter above Threshold size Strings
# using filter() + lambda
res = list(filter(lambda ele: len(ele) >= thres, test_list))
  
# printing result
print("The above Threshold size strings are : " + str(res))

Output :

The original list : ['gfg', 'is', 'best', 'for', 'geeks']
The above Threshold size strings are : ['best', 'geeks']

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Python – Filter above Threshold size Strings