How to Check if a Word Exists Within a String in Python?

Determining Word Presence in a String in Python

In Python, checking if a word exists within a string can be effortlessly accomplished using various methods. One common approach is employing the .find() method, which returns the index of the first occurrence of the specified word within the string. However, another straightforward way to achieve this is through an if statement that leverages the in operator.

To elaborate, the in operator evaluates whether a value is a member of a sequence or container. In the context of a string, the in operator can be used to determine if a particular word is contained within the string. This enables the following concise syntax:

if word in my_string:
    print('success')

In this example, word represents the word you want to locate within the string my_string. If the word is found within the string, the if statement evaluates to True, executing the code within the indented block.

To illustrate further, consider the following code snippet:

my_string = "Hello, world."
word = "world"

if word in my_string:
    print('success!')  # This line will execute because "world" is in the string.

Conversely, if the word is not present in the string, the if statement evaluates to False, and the code within the indented block is skipped.

By utilizing the in operator in conjunction with an if statement, you can effectively determine if a specified word is present within a given string in Python. This straightforward approach provides a concise and readable solution to this common task.

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