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Python is one of the languages commonly used by programmers across the globe for various purposes such as machine learning, data science, web development and to perform many other automation operations. It has many different features that help us work on many different projects. One of the features of Python is union operations. The union operation refers to merging two different strings into a common string while removing all common elements in both strings. In this article, we will learn the different methods that can be used for the union operation of two strings.
Sets is a feature provided in Python for storing multiple items in a dataset. It has a built-in function to remove all common elements from a string. Let's take an example to understand it better:
def multiple_strings(first, second): # The input of both the strings are given data1 = set(first) # Both the strings are then converted into data sets data2 = set(second) union_data = data1.union(data2) # After conversion, the data sets are combined with the help of union operation final_string = ''.join(union_data) # The Combined data set is then converted back into strings return final_string # Example first = "What" # The two input strings are defined second = "Where" final_result = multiple_strings(first, second) # The function multiple_strings is run print(final_result) # The output after union Operation Will be shown
The output of the above example will look like this:
Wraeth
In this method, we will use Python dictionary for union operation. A dictionary will be used to store all the data as strings and then perform a union operation on them. An example of a union operation using this method is as follows:
def multiple_strings(first, second): # The input of both the strings are given union_dict = {} # A new dictionary is created for the union operation for char in first: # All the elements in both the strings are checked and then they are added in the new dictionary created union_dict[char] = True for char in second: union_dict[char] = True # No duplicate characters will be added because dictionary keys will take input of different characters only union_string = ''.join(union_dict.keys()) # Once the union operation of the keys is performed, then we will convert the dictionary key back into string return union_string # Example first = "What" # The two input strings are defined second = "Where" final_result = multiple_strings(first, second) # The function multiple_strings is run print(final_result) # The output after union Operation Will be shown
The output of the above example will look as follows:
Whater
This is a very simple way to perform a union operation. We just need to convert the string to a list for the union operation. An example of this approach is as follows:
def multiple_strings(first, second): # The input of both the string is given combined_strings = list(first) # The first string is converted into a list for char in second: #If the element in second string is not present in first string then they are combined into the first list and the union operation is performed if char not in combined_strings: combined_strings.append(char) final_string = ''.join(combined_strings) #The lists are then converted back into string return final_string # Example first = "What" # The two input strings are defined second = "Where" final_result = multiple_strings(first, second) # The function multiple_strings is run print(final_result) # The output after union Operation Will be shown
The output of the above example will look as follows:
Whater
This method is a complex method and should not be used in simple combination situations. In this method, the string is converted into a set and then we will use the pipe operator instead of using the union directly. Let us take an example to understand better:
def multiple_strings(first, second): # The input of both the string is given first_set = set(first) # Both the strings are converted into sets second_set = set(second) final_string = ''.join(first_set | second_set) # Using the pipe operator the respective sets are combined after removing the common elements return final_string # Example first = "What" # The two input strings are defined second = "Where" final_result = multiple_strings(first, second) # The function multiple_strings is run print(final_result) # The output after union Operation Will be shown
The output of the above example will look like this:
Wraeth
itertools module is used to efficiently check all cycles in a data set. It has many different functions that can be used for many different purposes. We will use two different functions to perform the union operation. Let us understand better through an example:
import itertools # Do not forget to import itertools or else error might occur def unique_everseen(iterable, key=None): seen = set() seen_add = seen.add if key is None: # The input of both the string is given for element in itertools.filterfalse(seen.__contains__, iterable):# Through the chain() function we will combine both the strings into cone common string seen_add(element) yield element else: for element in iterable: k = key(element) if k not in seen: seen_add(k) yield element def multiple_strings(first, second): # The input of both the string is given union_string = ''.join(unique_everseen(itertools.chain(string1, string2)))# With the help of unique.everseen() function we will remove all the common elements from the combined string return union_string # Example first = "What" # The two input strings are defined second = "Where" final_result = multiple_strings(first, second) # The function multiple_strings is run print(final_result) # The output after union Operation Will be shown
The output of the above example will look as follows:
Wraeth
It is important to understand the different methods that can be used to perform the union operation. This article describes the different methods you can use to perform a union operation. Depending on convenience and application area, any of the above methods can be used.
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