How to check if a given Python string is a substring of another one?

How to check if a given Python string is a substring of another one?

You can check if a given Python string is a substring of another string by using the in operator or by using the str.find() method. Here are both approaches:

Using the in Operator:

The in operator can be used to check if one string is a substring of another. It returns True if the substring is found and False otherwise.

main_string = "Hello, world!" substring = "world" if substring in main_string: print(f"'{substring}' is a substring of '{main_string}'") else: print(f"'{substring}' is not a substring of '{main_string}'")

Using the str.find() Method:

The str.find() method returns the index of the first occurrence of a substring within the main string. If the substring is not found, it returns -1.

main_string = "Hello, world!" substring = "world" if main_string.find(substring) != -1: print(f"'{substring}' is a substring of '{main_string}'") else: print(f"'{substring}' is not a substring of '{main_string}'")

Both of these methods will allow you to check if one string is a substring of another in Python. Choose the one that fits your specific use case and coding style.

Examples

  1. "Python check if string is substring" Description: Learn how to check if a string is a substring of another string in Python using the in operator. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if substring in main_string: print("Substring found") else: print("Substring not found")

  2. "Python substring check in string" Description: Understand how to perform a substring check in Python using the str.find() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.find(substring) != -1: print("Substring found") else: print("Substring not found")

  3. "Python detect substring in string" Description: Explore how to detect a substring in a string in Python using the str.index() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" try: # Check if substring is in the main string main_string.index(substring) print("Substring found") except ValueError: print("Substring not found")

  4. "Python substring containment check" Description: Find out how to check if a string contains a substring in Python using the str.contains() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.contains(substring): print("Substring found") else: print("Substring not found")

  5. "Python string includes substring" Description: Learn how to determine if a string includes a substring in Python using the str.find() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.find(substring) != -1: print("Substring found") else: print("Substring not found")

  6. "Python check if string contains substring" Description: Understand how to check if a string contains a substring in Python using the str.find() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.find(substring) != -1: print("Substring found") else: print("Substring not found")

  7. "Python substring existence in string" Description: Explore how to determine the existence of a substring in a string in Python using the str.find() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.find(substring) != -1: print("Substring found") else: print("Substring not found")

  8. "Python search substring in string" Description: Find out how to search for a substring in a string in Python using the str.find() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.find(substring) != -1: print("Substring found") else: print("Substring not found")

  9. "Python find substring in string" Description: Learn how to find a substring in a string in Python using the str.find() method. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if main_string.find(substring) != -1: print("Substring found") else: print("Substring not found")

  10. "Python substring presence check" Description: Understand how to check for the presence of a substring in a string in Python using the in operator. Code:

    # Define the main string main_string = "Hello, world!" # Define the substring substring = "world" # Check if substring is in the main string if substring in main_string: print("Substring found") else: print("Substring not found")

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