In Python 3.10, we can replace a substring within a string using the replace() method. It takes two arguments - the substring to be replaced and the new substring to be used as the replacement.
Here's an example:
string = "Hello World"
new_string = string.replace("World", "Python")
print(new_string)
Output:
Hello Python
In the above example, we replaced the substring "World" with "Python" in the original string "Hello World". The replace() method returned the new string "Hello Python".
We can also replace multiple occurrences of a substring by specifying an optional third argument, which is the maximum number of replacements to make.
Here's an example:
string = "Python is awesome, Python is powerful, and Python is popular"
new_string = string.replace("Python", "Java", 2)
print(new_string)
Output:
Java is awesome, Java is powerful, and Python is popular
In the above example, we replaced the first two occurrences of the substring "Python" with "Java" in the original string. The replace() method returned a new string "Java is awesome, Java is powerful, and Python is popular".