Python rfind string method

## python rfind() method

the `rfind()` method in python is used to find the last occurrence of a substring within a string. it returns the highest index where the substring is found, or -1 if the substring is not found.

### syntax:

- `string`: the original string in which you want to search for the substring.
- `substring`: the substring you want to find within the string.
- `start` (optional): the starting index for the search within the string. default is 0.
- `end` (optional): the ending index for the search within the string. default is the length of the string.

### return value:
- the `rfind()` method returns the highest index of the substring found within the string, or -1 if the substring is not found.

### example:

### output:

in the example above, the `rfind()` method is used to find the last occurrence of the substring "hello" within the string `my_string`. the method returns the index 13, which is the highest index at which "hello" is found in the string.

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#python method naming convention
#python method documentation
#python method vs function
#python method decorator
#python method comments

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