How do I check if a value is a substring of a string in Python?
Benjamin C

To check if a value is a substring of a string in Python, you can use thein operator or thefind() method. Here's a detailed explanation of both approaches: 1. Using thein operator: Thein operator allows you to check if a substring exists within a string. It returnsTrue if the substring is found, andFalse otherwise.

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string = "Hello, World!"

if "Hello" in string:
    print("Substring found.")
else:
    print("Substring not found.")

Output:

Substring found.

In this example, thein operator is used to check if the substring "Hello" exists in thestring. Since the substring is present, the condition evaluates toTrue, indicating that the substring is found. 2. Using thefind() method: Thefind() method returns the index of the first occurrence of a substring within a string. If the substring is not found, it returns -1.

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string = "Hello, World!"

if string.find("Hello") != -1:
    print("Substring found.")
else:
    print("Substring not found.")

Output:

Substring found.

In this example, thefind() method is used to find the index of the substring "Hello" in thestring. Since the return value is not -1, it indicates that the substring is found, and the corresponding message is printed. Summary: To check if a value is a substring of a string in Python, you can use thein operator to directly check for substring existence or use thefind() method to find the index of the substring. Both approaches provide efficient ways to determine if a value is present within a string, allowing you to perform substring checks in your Python code.

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