Given two strings, the task is to write a python program to join them by every delimiter from delimiter list.
Input : test_str1 = ‘GeeksforLazyroar’, test_str2 = “Best”, join_list = [“+”, “*”, “-“, “$”, “,”, “@”]
Output : [‘GeeksforLazyroar+Best’, ‘GeeksforLazyroar*Best’, ‘GeeksforLazyroar-Best’, ‘GeeksforLazyroar$Best’, ‘GeeksforLazyroar,Best’, ‘GeeksforLazyroar@Best’]
Explanation : Elements are concatenated with all desired delimiters.
Input : test_str1 = ‘GeeksforLazyroar’, test_str2 = “Best”, join_list = [“+”, “*”, “-“, “$”]
Output : [‘GeeksforLazyroar+Best’, ‘GeeksforLazyroar*Best’, ‘GeeksforLazyroar-Best’, ‘GeeksforLazyroar$Best’]
Explanation : Elements are concatenated with all desired delimiters.
Method 1 : Using list comprehension
In this, we iterate through all the delimiters from list using loop inside list comprehension and + operator performs task of concatenation.
Example:
Python3
# initializing stringstest_str1 = 'GeeksforLazyroar'test_str2 = "Best"# printing original stringsprint("The original string 1 is : " + str(test_str1))print("The original string 2 is : " + str(test_str2))# initializing join listjoin_list = ["+", "*", "-", "$", ",", "@"]# + operator used for concatenationsres = [test_str1 + delim + test_str2 for delim in join_list]# printing resultprint("All delimiters concatenations : " + str(res)) |
Output:
The original string 1 is : GeeksforLazyroar
The original string 2 is : Best
All delimiters concatenations : [‘GeeksforLazyroar+Best’, ‘GeeksforLazyroar*Best’, ‘GeeksforLazyroar-Best’, ‘GeeksforLazyroar$Best’, ‘GeeksforLazyroar,Best’, ‘GeeksforLazyroar@Best’]
Method 2 : Using join() and list comprehension
Similar to above method, difference being task of joining is performed using join(), rather than + operator.
Example:
Python3
# initializing stringstest_str1 = 'GeeksforLazyroar'test_str2 = "Best"# printing original stringsprint("The original string 1 is : " + str(test_str1))print("The original string 2 is : " + str(test_str2))# initializing join listjoin_list = ["+", "*", "-", "$", ",", "@"]# join() operator used for concatenationsres = [delim.join([test_str1, test_str2]) for delim in join_list]# printing resultprint("All delimiters concatenations : " + str(res)) |
Output:
The original string 1 is : GeeksforLazyroar
The original string 2 is : Best
All delimiters concatenations : [‘GeeksforLazyroar+Best’, ‘GeeksforLazyroar*Best’, ‘GeeksforLazyroar-Best’, ‘GeeksforLazyroar$Best’, ‘GeeksforLazyroar,Best’, ‘GeeksforLazyroar@Best’]
The time and space complexity for all the methods are the same:
Time Complexity: O(n)
Space Complexity: O(n)
Method 3 : Using the format() method
This approach involves the use of the format() method which allows you to format the string.
Python3
#initializing stringstest_str1 = 'GeeksforLazyroar'test_str2 = "Best"#printing original stringsprint("The original string 1 is : " + str(test_str1))print("The original string 2 is : " + str(test_str2))#initializing join listjoin_list = ["+", "*", "-", "$", ",", "@"]#using format method for concatenationsres = [f"{test_str1}{delim}{test_str2}" for delim in join_list]#printing resultprint("All delimiters concatenations : " + str(res))#This code is contributed by Edula Vinay Kumar Reddy |
The original string 1 is : GeeksforLazyroar The original string 2 is : Best All delimiters concatenations : ['GeeksforLazyroar+Best', 'GeeksforLazyroar*Best', 'GeeksforLazyroar-Best', 'GeeksforLazyroar$Best', 'GeeksforLazyroar,Best', 'GeeksforLazyroar@Best']
Time Complexity: O(n)
Auxiliary Space: O(n)
Method 4 : using a loop and string concatenation
step-by-step breakdown of the program:
- Initialize two string variables test_str1 and test_str2 with values “GeeksforLazyroar” and “Best” respectively.
- Initialize a list variable join_list with values [“+”, “*”, “-“, “$”, “,”, “@”] which are the delimiters to use for concatenating the two strings.
- Initialize an empty list res that will hold the concatenated strings with each delimiter.
- Start a loop that will iterate through each delimiter in the join_list list.
- Within the loop, concatenate test_str1, the current delimiter, and test_str2 together into a single string, using the + operator.
- Append the resulting string to the res list.
- After the loop has finished, print the res list, with a message “All delimiters concatenations : ” concatenated with the string representation of the list.
- End of program.
Python3
# Initializing stringstest_str1 = 'GeeksforLazyroar'test_str2 = "Best"# Initializing join listjoin_list = ["+", "*", "-", "$", ",", "@"]# Using loop and string concatenationres = []for delim in join_list: res.append(test_str1 + delim + test_str2)# Printing resultprint("All delimiters concatenations : " + str(res)) |
All delimiters concatenations : ['GeeksforLazyroar+Best', 'GeeksforLazyroar*Best', 'GeeksforLazyroar-Best', 'GeeksforLazyroar$Best', 'GeeksforLazyroar,Best', 'GeeksforLazyroar@Best']
The time complexity of this approach is O(n), where n is the number of delimiters.
The auxiliary space complexity is also O(n), since the result list res grows with the number of delimiters.
