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Python | Find Mixed Combinations of string and list

  • Last Updated : 26 Nov, 2019

Sometimes, while working with Python, we can have a problem in which we need to make combinations of string and character list. This type of problem can come in domains in which we need to interleave the data. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop + enumerate() + replace()
This task can be performed using combination of above functions. In this, we just iterate each element of character list and insert each combination using brute force way.




# Python3 code to demonstrate working of
# Mixed Combinations of string and list
# using loop + enumerate() + replace()
  
# initialize list and string 
test_list = ["a", "b", "c"]
test_str = "gfg"
  
# printing original list and string
print("The original list : " + str(test_list))
print("The original string : " + test_str)
  
# Mixed Combinations of string and list
# using loop + enumerate() + replace()
res = []
for idx, ele in enumerate(test_str):
    res += [test_str[ : idx] + test_str[idx : ].replace(ele, k, 1)
            for k in test_list]
  
# printing result
print("The list after mixed Combinations : " + str(res))
Output :

The original list : [‘a’, ‘b’, ‘c’]
The original string : gfg
The list after mixed Combinations : [‘afg’, ‘bfg’, ‘cfg’, ‘gag’, ‘gbg’, ‘gcg’, ‘gfa’, ‘gfb’, ‘gfc’]

 



Method #2 : Using list comprehension
The above functionality can be used to perform this task. In this, we provide a one-line alternative using comprehension.




# Python3 code to demonstrate working of
# Mixed Combinations of string and list
# using list comprehension
  
# initialize list and string 
test_list = ["a", "b", "c"]
test_str = "gfg"
  
# printing original list and string
print("The original list : " + str(test_list))
print("The original string : " + test_str)
  
# Mixed Combinations of string and list
# using list comprehension
res = [test_str[ : idx] + ele + test_str[idx + 1 : ]\
      for idx in range(len(test_str)) for ele in test_list]
  
# printing result
print("The list after mixed Combinations : " + str(res))
Output :

The original list : [‘a’, ‘b’, ‘c’]
The original string : gfg
The list after mixed Combinations : [‘afg’, ‘bfg’, ‘cfg’, ‘gag’, ‘gbg’, ‘gcg’, ‘gfa’, ‘gfb’, ‘gfc’]

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