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Python – String concatenation in Heterogenous list
  • Last Updated : 23 Jan, 2020

Sometimes, while working with Python, we can come across a problem in which we require to find the concatenation of strings. This problem is easier to solve. But this can get complex in case we have mixture of data types to go along with it. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop + conditions
We can employ a brute force method to type caste check each element, if its a string we concatenate it. This can ensure that only strings are concatenated and hence can solve the problem.

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# Python3 code to demonstrate working of
# String concatenation in Heterogenous list
# using loop + conditions
  
# initializing list
test_list = [5, 6, "gfg ", 8, (5, 7), ' is', 9, ' best']
  
# printing original list
print("The original list is : " + str(test_list))
  
# String concatenation in Heterogenous list
# using loop + conditions
res = ''
for ele in test_list:
    if type(ele) == str:
        res += ele 
          
# printing result 
print("Concatenation of strings in list : " + str(res))

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Output :

The original list is : [5, 6, 'gfg ', 8, (5, 7), ' is', 9, ' best']
Concatenation of strings in list : gfg  is best

 

Method #2 : Using join() + isinstance()
This problem can also be solved using the inbuilt function of join() and it also supports the instance filter using isinstance() which can be feeded with strings and hence solve the problem.



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# Python3 code to demonstrate working of
# String concatenation in Heterogenous list
# using join() + isinstance()
  
# initializing list
test_list = [5, 6, "gfg ", 8, (5, 7), ' is', 9, ' best']
  
# printing original list
print("The original list is : " + str(test_list))
  
# String concatenation in Heterogenous list
# using join() + isinstance()
res = "".join(filter(lambda i: isinstance(i, str), test_list))
  
# printing result 
print("Concatenation of strings in list : " + str(res))

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Output :

The original list is : [5, 6, 'gfg ', 8, (5, 7), ' is', 9, ' best']
Concatenation of strings in list : gfg  is best

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