Python – Length Conditional Concatenation

Last Updated : 30 Aug, 2020

Given a list of strings, perform concatenation of Strings whose length is greater than K.

Input : test_list = [“Gfg”, ‘is’, “Best”, ‘for’, ‘CS’, ‘Everything’], K = 3
Output : BestEverything
Explanation : All elements with Length > 3 are concatenated.
Input : test_list = [“Gfg”, ‘is’, “Best”, ‘for’, ‘CS’, ‘Everything’], K = 1
Output : GfgisBestforCSEverything
Explanation : All elements with Length > 1 are concatenated.

Method #1 : Using loop + len()

This offers brute way to solve this problem. In this, we iterate for each string and perform concatenation if the string length is greater than K using len().

Python3

# Python3 code to demonstrate working of 
# Length Conditional Concatenation
# Using loop + len()
  
# initializing lists
test_list = ["Gfg", 'is', "Best", 'for', 'CS', 'Everything']
  
# printing original list
print("The original list : " + str(test_list))
  
# initializing K 
K = 2
  
# loop to run through all the elements
res = ''
for ele in test_list:
      
    # using len() to check for length
    if len(ele) > 2:
        res += ele
  
# printing result 
print("String after Concatenation : " + str(res))

Output

The original list : ['Gfg', 'is', 'Best', 'for', 'CS', 'Everything']
String after Concatenation : GfgBestforEverything

Method #2 : Using join() + filter() + lambda + len()

The combination of above functions can be used to solve this problem. In this, we perform concatenation using join(), filter and lambda are used for conditional check using len().

Python3

# Python3 code to demonstrate working of 
# Length Conditional Concatenation
# Using join() + filter() + lambda + len()
  
# initializing lists
test_list = ["Gfg", 'is', "Best", 'for', 'CS', 'Everything']
  
# printing original list
print("The original list : " + str(test_list))
  
# initializing K 
K = 2
  
# join() performing Concatenation of required strings
res = ''.join(filter(lambda ele: len(ele) > K, test_list))
  
# printing result 
print("String after Concatenation : " + str(res))

Output

The original list : ['Gfg', 'is', 'Best', 'for', 'CS', 'Everything']
String after Concatenation : GfgBestforEverything

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