How do I check if string contains substring?

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To check if a string contains a substring in Python, you can use the in keyword or the str.find() method. Here's how to do it with both methods, along with examples:

  1. Using the in keyword:
python
# Define the main string
main_string = "Hello, World!"

# Define the substring you want to check for
substring = "World"

# Check if the substring is present in the main string
if substring in main_string:
    print(f"'{main_string}' contains the substring '{substring}'.")
else:
    print(f"'{main_string}' does not contain the substring '{substring}'.")

Output:

sql
'Hello, World!' contains the substring 'World'.
  1. Using the str.find() method:
python
# Define the main string
main_string = "Hello, World!"

# Define the substring you want to check for
substring = "World"

# Check if the substring is present in the main string using str.find()
if main_string.find(substring) != -1:
    print(f"'{main_string}' contains the substring '{substring}'.")
else:
    print(f"'{main_string}' does not contain the substring '{substring}'.")

Output (same as above):

sql
'Hello, World!' contains the substring 'World'.

Both of these methods will allow you to check if a string contains a substring in Python.

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