Given pair of strings, which is multiline, perform concatenation horizontally.
Examples:
Input :
test_str1 = ”’
Lazyroar for
Lazyroar”’,
test_str2 = ”’
is
best”’
Output :
Lazyroar foris
Lazyroarbest
Explanation : 1st line joined with 1st line of 2nd string, “Lazyroar for” -> “is”.Input :
test_str1 = ”’
Lazyroar for ”’
test_str2 = ”’
Lazyroar ”’
Output :
Lazyroar for Lazyroar
Explanation : 1st line joined with 1st line of 2nd string, “Lazyroar for ” -> “Lazyroar”.
Method #1 : Using zip() + split() + join() + list comprehension
In this, we perform the task of splitting by “\n” using split(), and they are paired together using zip(). The next step is joining both the zipped strings for horizontal orientation using “\n” and join().
Python3
# Python3 code to demonstrate working of# Horizontal Concatenation of Multiline Strings# Using zip() + split() + join() + list comprehension# initializing stringstest_str1 = '''Lazyroar 4Lazyroar'''test_str2 = '''isbest'''# printing original stringsprint("The original string 1 is : " + str(test_str1))print("The original string 2 is : " + str(test_str2))# split linessplt_lines = zip(test_str1.split('\n'), test_str2.split('\n'))# horizontal joinres = '\n'.join([x + y for x, y in splt_lines])# printing resultprint("After String Horizontal Concatenation : " + str(res)) |
The original string 1 is : Lazyroar 4 Lazyroar The original string 2 is : is best After String Horizontal Concatenation : Lazyroar 4is Lazyroarbest
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #2 : Using map() + operator.add + join()
In this, we use map() to with help of add() to perform concatenation, split() is used to perform initial split by “\n”.
Python3
# Python3 code to demonstrate working of# Horizontal Concatenation of Multiline Strings# Using map() + operator.add + join()from operator import add# initializing stringstest_str1 = '''Lazyroar 4Lazyroar'''test_str2 = '''isbest'''# printing original stringsprint("The original string 1 is : " + str(test_str1))print("The original string 2 is : " + str(test_str2))# using add to concat, map() to concat each lines zippedres = '\n'.join(map(add, test_str1.split('\n'), test_str2.split('\n')))# printing resultprint("After String Horizontal Concatenation : " + str(res)) |
The original string 1 is : Lazyroar 4 Lazyroar The original string 2 is : is best After String Horizontal Concatenation : Lazyroar 4is Lazyroarbest
Time Complexity: O(n) -> ( join function)
Auxiliary Space: O(n)
Method 3: using the itertools.zip_longest() function, split() function, and a for loop.
Step-by-step approach:
- Import the itertools module.
- Initialize the strings as multiline strings.
- Split the strings using the split() function and store them in separate variables.
- Create a list comprehension to join the corresponding lines from both strings together horizontally.
- Join the elements in the list comprehension using the join() function and store them in a new variable.
- Print the resulting string.
Below is the implementation of the above approach:
Python3
# Python3 code to demonstrate working of# Horizontal Concatenation of Multiline Strings# Using itertools.zip_longest() and for loop# import itertools moduleimport itertools# initializing stringstest_str1 = '''Lazyroar 4Lazyroar'''test_str2 = '''isbest'''# printing original stringsprint("The original string 1 is : " + str(test_str1))print("The original string 2 is : " + str(test_str2))# split the stringstest_list1 = test_str1.split('\n')test_list2 = test_str2.split('\n')# join corresponding lines horizontallyresult = ""for line1, line2 in itertools.zip_longest(test_list1, test_list2, fillvalue=""): result += line1 + line2 + "\n"# printing resultprint("After String Horizontal Concatenation : " + str(result)) |
The original string 1 is : Lazyroar 4 Lazyroar The original string 2 is : is best After String Horizontal Concatenation : Lazyroar 4is Lazyroarbest
Time complexity: O(n), where n is the total number of characters in both strings.
Auxiliary space: O(n), where n is the total number of characters in both strings.
