Python

Python Check If String Contains Substring from List

Strings in Python are a collection of characters contained in single or double-quotes. You may need to check if a string contains a substring during various string manipulation actions. With the help of the IN keyword and the IF statement, you can see if a string includes a substring. We’ll verify if a python string has a substring in this Python lesson. We examine the various strategies and discuss their applications in depth. There are many scenarios when we need to identify if a python string includes a substring, but conditional statements are usually the most typical applications. In this situation, a specific code is executed. Another popular application is to determine the index of a substring within a string. The _contains_ function is probably something you’ve seen in other computer programming languages. The _contains_ method is also supported by Python. It also includes a couple of ways to check if a Python string contains a faster and more understandable substring.

We’ll discuss these in more detail later. During Python web development, we frequently encounter a scenario in which we must determine whether a specific member from a given list is a sub-string or not. This is a relatively prevalent problem in the Machine Learning sector. Let’s look at some options for accomplishing this. Now we’ll go through different ways to check whether a string has a substring in Python. Each has its own set of applications and advantages and disadvantages, some of which can be found in String containing a substring in Python. Remember that the in operator is the easiest way to identify if a string includes a substring.

Example 1:

We are going to use list comprehension in our first example. List comprehension is commonly used to address the problem of finding whether a string has a substring from a list or not. In this case, we check for both list and string entries to see if we can find a match, and if we do, it returns true as a result. The code below demonstrates how to use list comprehension to determine whether or not a text includes a list element. First, the string with the name first_str has been initialized. The test list (named my_list) was also initialized after that. We printed the original string and list before performing the function for your convenience. Following that, we used list comprehension to see if the string contained the list element and then printed out the result.

first_str = "Two persons in the room each take up two apples."

my_list = ['apples', 'oranges']

print("Original string : " + first_str)

print("Original list : " + str(my_list))

myres = [ele for ele in my_list if(ele in first_str)]

print("Is there a list element in the string? " + str(bool(myres)))

Attached is the output of the above code.

Example 2:

Here we are going to use any() function. This is the easiest method of performing this task. This function compares each element of the list to a string match. The code below demonstrates how to use list comprehension to determine whether or not a text contains a list element. To begin, the string named first_str has been initialized. After that, the test list (dubbed “my_list”) was created. Before completing the function, we printed the original string and list for your convenience. The difference can be seen with the next line of code where we have stored the result in myres variable. Then we applied the method to see if the string contained the list element and printed the result.

The output of the given code can be seen here.

Example 3:

We’ll use two strings in this example. One will be called first_str and represent the first string, while the other will be called scnd_str and display a list of strings. We’ll use the for loop to see if the string from the list is a substring in the source string. The item from list ‘e’ appears as a substring in the source text, as seen in the code, and so the condition in the if loop returns True during the execution for the element ‘e’ in the for loop.

first_str= 'x t v y z e'

scnd_str = ['t', 'm', 'e' ]

for substring in scnd_str:

  if substring in first_str:

     print('String includes a substring from list.')

     break

The output of the above code can be seen in the image below.

Conclusion:

This Python lesson taught us how to verify if a string includes a substring from a list of strings using sample programs for your help. We are now very well aware of the fact that the in operator is the most straightforward approach to determine whether a Python text includes a substring. The in operator in Python is basically used to check for data structure membership. It returns either False or True. In Python, we may use the in operator on the superstring to see if a string has a substring. This operator is the best way for using the __contains__ method on an object. It’s worth noting that it’s not null-safe, so an exception would be issued if our complete string pointed to None.

About the author

Kalsoom Bibi

Hello, I am a freelance writer and usually write for Linux and other technology related content

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