Which string method in Python is used to replace parts of a string?

The .replace() method in Python is used to replace occurrences of a specified substring within a string with another substring. It returns a new string with the replacements made.

text = "Hello, World!"
new_text = text.replace("World", "Python")
print(new_text)  # Prints "Hello, Python!"

This method is useful for tasks like text substitution, data cleaning, and formatting, where you need to modify specific parts of a string.

Using the .replace() method allows you to efficiently alter strings without manually changing each instance of a substring.